CN218128354U

CN218128354U - Rolling brush driving device and surface cleaning equipment

Info

Publication number: CN218128354U
Application number: CN202221451633.0U
Authority: CN
Inventors: 邱日居
Original assignee: Changzhou Xinqida Electric Co ltd
Current assignee: Changzhou Xinqida Electric Co ltd
Priority date: 2022-06-10
Filing date: 2022-06-10
Publication date: 2022-12-27
Anticipated expiration: 2032-06-10

Abstract

The utility model relates to the field of cleaning tools, in particular to a rolling brush driving device, which comprises a shell, a motor, a planetary wheel mechanism, a belt transmission mechanism and a rolling brush coupler for coupling a rolling brush; the motor transmits the rotary power to the rolling brush coupler through the planetary wheel mechanism and the belt transmission mechanism; the planetary gear mechanism is provided with a driving shaft extending into the shell, and the rolling brush coupler is provided with a coupling shaft extending into the shell; the driving wheel of the belt transmission mechanism is fixedly connected to the driving shaft, and the driven wheel of the belt transmission mechanism is fixedly connected to the coupling shaft; the shell comprises a seat body, and the driving shaft is provided with a first end part extending into the seat body; the pedestal is provided with: a first bracket for positioning the first end portion and configured to allow rotation of the drive shaft but restrict movement of the drive shaft; the first bracket is integrally jointed with the base body, so that the first bracket has the strength for keeping the driving shaft to stably operate.

Description

Rolling brush driving device and surface cleaning equipment

Technical Field

The utility model relates to a burnisher field especially relates to a round brush drive arrangement and surface cleaning equipment.

Background

The main operation mode of the surface cleaning equipment is a hand-push type or driving type, the whole machine is driven by a motor, the cleaning capability is strong, time and labor are saved when the surface cleaning equipment is used, and the surface cleaning equipment is applied to daily life more and more widely by people. This kind of equipment is at the during operation, the round brush that sets up on its organism can be rotatory with certain speed under round brush drive arrangement's effect, but the round brush can become heavy after being stained with water, the moment of torsion that the motor exported under the unchangeable circumstances of power is little, the round brush stall's condition can also appear sometimes, can not effectively clean subaerial filth this moment, can't reach good clean effect, for increasing the round brush moment of torsion among the prior art, can set up planetary wheel mechanism in the round brush drive arrangement in order to increase the round brush moment of torsion, but planetary wheel mechanism can make the structure of complete machine when the operation unstable when increasing the round brush moment of torsion, for example, the drive shaft of planetary wheel mechanism is when the transmission moment of torsion, especially after using a period, produce the swing easily, lead to the noise increase, and influence clean efficiency, so the utility model provides a new round brush drive arrangement and surface cleaning equipment that the operation is stable, the noise is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome prior art not enough, and provide a round brush drive arrangement and surface cleaning equipment.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a rolling brush driving device comprises a shell, a motor, a planetary wheel mechanism, a belt transmission mechanism and a rolling brush coupler for coupling a rolling brush; the motor transmits the rotary power to the rolling brush coupler through the planetary wheel mechanism and the belt transmission mechanism; the planetary gear mechanism is provided with a driving shaft extending into the shell, and the rolling brush coupler is provided with a coupling shaft extending into the shell; the driving wheel of the belt transmission mechanism is fixedly connected to the driving shaft, and the driven wheel of the belt transmission mechanism is fixedly connected to the coupling shaft; the shell comprises a base body and a cover plate, a mounting cavity is formed between the cover plate and the base body, and the driving shaft comprises a first end part extending into the mounting cavity from one side of the base body; the base body is provided with: a first bracket for positioning the first end portion and configured to allow rotation of the drive shaft but restrict movement of the drive shaft; the first bracket is integrally jointed with the base body, so that the first bracket has the strength for keeping the driving shaft stably operated.

The technical scheme can be further perfected as follows:

preferably, a first bearing is engaged with the first end, a first recess for positioning the first bearing is formed on the first bracket, and an opening of the first recess for inserting the first bearing is disposed toward the driving wheel.

Preferably, the coupling shaft has a third end portion extending into the seat body, a second bracket for positioning the third end portion is arranged on the seat body, and the second bracket is suitable for limiting the movement of the coupling shaft; wherein the second bracket is integrally joined to the housing so that the second bracket has a strength to maintain the stable operation of the coupling shaft.

Preferably, the planetary gear mechanism comprises a sun gear, a planetary gear set rotating around the sun gear, and a planet carrier for positioning the planetary gear set, the drive shaft being detachably engaged on the planet carrier to take rotational power.

Preferably, the driving wheel is arranged between the first bracket and the planet carrier.

Preferably, the planetary gear set, the sun gear and the planet carrier are all arranged on the outer side of the seat body, and the driving wheel is arranged on the inner side of the seat body.

Preferably, a first bearing is joined to the first end portion, a first recess for positioning the first bearing is formed in the first bracket, and an opening of the first recess for receiving the first bearing is disposed toward the drive wheel.

Preferably, a first through hole for the first bearing and the driving wheel to pass through is formed in the bottom wall of the seat body, so that the part of the driving shaft, where the first bearing and the driving wheel are installed, is installed from the outer side of the seat body to the inner side of the seat body.

Preferably, the drive shaft is provided with a second bearing, and the outer diameter of the second bearing is larger than that of the first perforation, so that the second bearing is abutted against the outer wall of the first perforation after the first bearing and the driving wheel pass through the first perforation.

Preferably, the drive shaft has a second end portion protruding out of the second bearing, and the second end portion is fixedly connected with the carrier.

Preferably, the planetary gear mechanism further includes a housing fixedly connected to an outer side of the base, and the planetary gear set, the sun gear and the planet carrier are all disposed in the housing.

Preferably, a coupling portion adapted to couple the roll brush is provided at an end of the coupling shaft opposite to the third end portion.

Preferably, a second through hole for the third end of the coupling shaft to pass through is formed in the bottom wall of the seat body, so that the third end is installed from the outer side of the seat body to the inner side of the seat body.

Preferably, the driven wheel is fixedly connected to a portion, located on the inner side of the seat, of the coupling shaft, and the diameter of the driven wheel is larger than that of the second through hole.

Preferably, a third bearing is joined to the third end, a second recess for positioning the third bearing is formed in the second bracket, and an opening of the second recess for receiving the third bearing is disposed opposite to the driven wheel.

Preferably, a notch for the driven wheel to be installed in the seat body is formed in the side wall of the seat body, and after the driven wheel is installed in the seat body, the coupling shaft penetrates through the second through hole and sequentially penetrates through the driven wheel, the second support and the third bearing.

Preferably, the second bracket bridges two opposite sidewalls of the housing.

Preferably, a third bearing is coupled to the third end, a third recess for positioning the third bearing is formed in the seat, and an opening of the third recess for receiving the third bearing is disposed toward the driven wheel.

Preferably, the first bracket is formed by extending the bottom wall of the holder body upwards.

Preferably, the first bracket has a connecting portion integrally engaging a sidewall of the seat body.

The utility model also provides a surface cleaning equipment, it includes handle components and scrubbing brush subassembly, the scrubbing brush subassembly includes round brush and drive the rotatory round brush drive arrangement of round brush, round brush drive arrangement is aforementioned round brush drive arrangement.

Since the technical scheme above is adopted, the utility model discloses following beneficial effect has:

the utility model discloses well motor passes through the planet wheel mechanism, belt drive mechanism transmits rotary power to round brush coupler, round brush coupler and round brush coupling rotate in order to drive the round brush, planet wheel mechanism has the drive shaft that extends into round brush drive arrangement casing, the drive shaft has the first end of the pedestal that stretches into the casing, be provided with first support on the pedestal and be used for fixing a position the first end and restrict the drive shaft and produce the removal when transmitting the moment of torsion, this removal produces the swing including receiving dragging of belt drive mechanism, also include the axial float that the drive shaft produced, and first support and pedestal formula as an organic whole joint, can increase the intensity that first support resists the effect force that the drive shaft was applyed on first support, thereby still can keep the stable function of drive shaft after long-time the use, also can not produce removal such as swing or axial float when the pivoted.

Drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the drawings of the embodiments will be briefly described below, and it is obvious that the drawings in the following description only relate to some embodiments of the present invention, and are not intended to limit the present invention.

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;

FIG. 2 is an exploded view of FIG. 1;

fig. 3 is a schematic structural view of a rolling brush driving device according to an embodiment of the present invention;

FIG. 4 is an exploded view of FIG. 3;

FIG. 5 isbase:Sub>A cross-sectional view taken along A-A of FIG. 3;

fig. 6 is an exploded view of a belt drive mechanism according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a driving shaft according to a first embodiment of the present invention;

fig. 8 is a schematic structural view of a seat body according to an embodiment of the present invention;

fig. 9 is a schematic view of a seat body at another angle according to an embodiment of the present invention;

FIG. 10 is a cross-sectional view of FIG. 8;

fig. 11 is a schematic structural view of a cover plate according to a first embodiment of the present invention;

fig. 12 is an exploded view of a rolling brush driving device according to a second embodiment of the present invention;

fig. 13 is a schematic structural view of a cover plate in the second embodiment of the present invention.

Reference numerals:

1. a roller brush drive device; 11. a base body; 111. a first bracket; 1111. a first recess; 1112. a connecting portion; 112. a second bracket; 1121. a second recess; 113. a first through hole; 114. a second perforation; 115. a notch; 12. a motor; 13. a planetary wheel mechanism; 131. a drive shaft; 1311. a first end portion; 1312. a second end portion; 1313. a first bearing; 1314. a second bearing; 132. a sun gear; 133. a planet wheel; 134. a planet carrier; 135. a housing; 1351. a ring gear; 14. a belt drive mechanism; 141. a driving wheel; 142. a driven wheel; 15. a roll brush coupler; 151 a coupling shaft; 1511. a third end portion; 1512. a coupling part; 1513. a third bearing; 2. and (7) rolling and brushing.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are used only to indicate relative positional relationships that may change when the absolute position of an object being described changes, and are merely for convenience in describing the invention and to simplify the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Features in the embodiments described below may be combined with each other without conflict.

The first embodiment is as follows:

referring to a roller brush driving device 1 shown in fig. 1-11, the roller brush 2 refers to a part of a surface cleaning apparatus for removing stains from a surface to be cleaned. The rolling brush driving device 1 comprises a shell, a motor 12, a planetary gear mechanism 13, a belt transmission mechanism 14 and a rolling brush coupler 1515 for coupling the rolling brush 2; the motor 12 transmits the rotary power to the rolling brush coupler 1515 through the planet wheel mechanism 13 and the belt transmission mechanism 14; the planetary gear mechanism 13 has a drive shaft 131 extending into the housing, and the roller brush coupler 1515 has a coupling shaft 151 extending into the housing; a driving wheel 141 of the belt transmission mechanism 14 is fixedly connected to the driving shaft 131, and a driven wheel 142 of the belt transmission mechanism 14 is fixedly connected to the coupling shaft 151; the housing includes a base 11 and a cover 16, the drive shaft 131 having a first end 1311 extending into the base 11; the seat body 11 is provided with: a first bracket 111 for positioning the first end 1311, and the first bracket 111 is configured to allow the driving shaft 131 to rotate but restrict the driving shaft 131 from moving; the first bracket 111 is integrally connected to the base 11, so that the first bracket 111 has a strength to keep the driving shaft 131 stably operating. The strength is strength of the first bracket 111 against the acting force applied by the driving shaft 131, and in the operating state, the driving shaft 131 is subjected to the radial acting force applied by the belt transmission mechanism 14, namely, the tensile force of the belt, and under the tensile force, if the strength of the first bracket 111 is insufficient, the driving shaft 131 swings to the side close to the driven wheel 142. In addition, in operation, the driving shaft 131 may generate an axial force on the first bracket 111, and if the strength of the first bracket 111 is insufficient, the driving shaft 131 may be caused to move in the axial direction thereof. The vibration or play may cause the driving shaft 131 to be unstable in operation, thereby generating noise and affecting the transmission of torque, thereby reducing the cleaning efficiency. Therefore, the strength of the first bracket 111 is increased to resist the force applied by the driving shaft 131, that is, the driving shaft 131 will not move in the form of swinging or moving due to deformation after being stressed. The movement is relative to rotation and refers to movement that produces a change in displacement, for example, the swinging of the drive shaft 131 produces a change in angular displacement and the play produces a change in axial displacement. The stable operation means that the noise and vibration of the roll brush are not significantly increased after 300 hours of operation.

Specifically, the belt transmission mechanism 14 includes a driving wheel 141, a driven wheel 142, and a transmission belt connecting the driving wheel 141 and the driven wheel 142, the belt transmission mechanisms 14 are all accommodated in the seat body 11, the driving wheel 141 is fixedly connected to the driving shaft 131, and the driven wheel 142 is fixedly connected to the coupling shaft 151.

As shown in fig. 5-10, the coupling shaft 151 has a third end 1511 extending into the holder body 11, the holder body 11 is provided with a second bracket 112 for positioning the third end 1511, and the second bracket 112 is adapted to limit the movement of the coupling shaft 151, which also includes swinging and play. Wherein the second bracket 112 is integrally engaged with the fastening body 11 to increase the stability of the second bracket 112 against the force exerted by the coupling shaft 151 on the second bracket 112, so as to maintain the stable operation of the coupling shaft 151.

In this embodiment, the second bracket 112 is configured to allow the coupling shaft 151 to rotate but restrict the coupling shaft 151 from moving, the coupling shaft 151 has a third end 1511 protruding into the housing 11, the housing 11 is provided with the second bracket 112 to position the third end 1511 in order to restrict the movement of the coupling shaft 151, and the second bracket 112 is configured to be integrally engaged with the housing 11 in order to increase the stability of the second bracket 112 against the force of the coupling shaft 151.

The planetary gear mechanism 13 comprises a sun gear 132, a set of planetary gears 133 rotating around the sun gear 132, and a planet carrier 134 for positioning the set of planetary gears 133, with a drive shaft 131 being fixed to the planet carrier 134, and with the planet gears engaging on the inside the sun gear 132 and on the outside the ring gear. In the present exemplary embodiment, the planetary gear set 133 has 3 planet gears, three of which simultaneously engage the ring gear and the sun gear. Of course, the planetary gear set 133 may also include 4 or 5 equal planetary gears, the planetary gear set 133 rotates around the sun gear 132 in the ring gear, the planetary gear 133 is rotatably connected to the planet carrier 134, when the planetary gear 133 rotates around the sun gear 132, the planet carrier 134 can also be driven to rotate to output the rotary power, and the driving shaft 131 is detachably connected to the planet carrier 134 to obtain the rotary power, and the two are specifically connected in a key manner. In another embodiment, the connection mode of the driving shaft 131 and the planet carrier 134 may also be a fixed connection mode such as welding, riveting, etc., as long as the connection mode capable of obtaining the rotation power from the planet carrier 134 can be applied to the technical solution of the present invention.

As shown in fig. 5, the driving pulley 141 is disposed between the first bracket 111 and the planet carrier 134, and specifically, the driving pulley 141 is disposed in the housing 11 and is fixed to the driving shaft 131. Specifically, the driving wheel 141 and the driving shaft 131 are fixedly connected integrally, that is, they are integrally formed. In another embodiment, the two may be separately formed and then fixedly connected.

The planetary gear set 133, the sun gear 132 and the planet carrier 134 are all disposed on the outer side of the base body 11, the driving wheel 141 is disposed on the inner side of the base body 11, the planetary gear mechanism 13 is disposed between the motor 12 and the base body 11, the motor 12 drives the planetary gear mechanism 13 to operate, and then the planetary gear mechanism 13 sequentially transmits the rotation power to the belt transmission mechanism 14 and the rolling brush 2 through the driving shaft 131, so as to drive the rolling brush 2 to rotate.

As shown in fig. 5 and 6, a first bearing 1313 is engaged with the first end portion 1311, a first recess 1111 for positioning the first bearing 1313 is formed on the first bracket 111, an opening of the first recess 1111 for receiving the first bearing 1313 is disposed toward the driver 141, that is, an opening of the first recess 1111 faces toward one side of the driver 141, so as to facilitate the first bearing 1313 to be inserted into the first recess 1111, and the first bearing 1313 and the first recess 1111 are in a close fitting manner. First bearing 1313 is first mounted on first end 1311, and then first bearing 1313 is fitted into first recess 1111 from the opening.

The bottom wall of the housing 11 is provided with a first through hole 113 for the first bearing 1313 and the driving wheel 141 to pass through, so that the portion of the driving shaft 131 where the first bearing 1313 and the driving wheel 141 are installed is installed from the outside of the housing 11 to the inside of the housing 11. In this embodiment, the first through hole 113 is formed in the bottom wall of the housing 11, the diameter of the first through hole 113 is larger than the diameters of the first bearing 1313 and the driving wheel 141, and after the first bearing 1313 and the driving wheel 141 are both mounted on the driving shaft 131, the first through hole 113 is inserted into the housing 11 from the outside of the housing 11.

The driving shaft 131 has a second bearing 1314, an outer diameter of the second bearing 1314 is greater than that of the first through hole 113, so that the second bearing 1314 abuts against an outer wall of the first through hole 113 after the first bearing 1313 and the driving wheel 141 pass through the first through hole 113, specifically, the second bearing 1314 is located outside the first through hole 113, a bearing seat for accommodating the second bearing 1314 is formed on the seat body 11, and the second bearing 1314 is fixed on the seat body 11 through a tablet.

The driving shaft 131 has a second end portion 1312 extending out of the second bearing 1314, the second end portion 1312 is detachably connected with the carrier 134, in this embodiment, the second end portion 1312 is connected with the carrier 134 by a key connection, but the connection of the second end portion 1312 with the carrier 134 may be other connection manners.

As shown in fig. 4, the planetary gear mechanism 13 further includes a housing 135 fixed to the outer side of the base 11, the planetary gear set 133, the sun gear 132, and the planet carrier 134 are all disposed in the housing 135, and in this embodiment, a ring gear is fixed inside the housing 135, and the planet gears revolve around the sun gear 132 along the ring gear.

A coupling portion 1512 is disposed at an end of the coupling shaft 151 opposite to the third end 1511, the coupling portion 1512 is adapted to couple with the roller brush 2, and in this embodiment, the coupling portion 1512 is a separable coupler, which is convenient for assembly and disassembly.

A second through hole 114 is formed in the bottom wall of the housing 11 for the third end 1511 of the coupling shaft 151 to pass through, so that the third end 1511 can be inserted into the housing 11 from the outside of the housing 11. The driven wheel 142 is fixed on the coupling shaft 151 at the inner side of the seat body 11, the diameter of the driven wheel 142 is larger than the second through hole 114, in this embodiment, the coupling shaft 151 penetrates through the second through hole 114 to enter the seat body 11, and then the driven wheel 142 is installed on the coupling shaft 151.

Third end 1511 is joined with third bearing 1513, second bracket 112 is formed with second recess 1121 for positioning third bearing 1513, and the opening of second recess 1121 for receiving third bearing 1513 is set back to driven wheel 142, in this embodiment, third end 1511 is inserted from the back side of the opening of second recess 1121, and then third bearing 1513 is received from the opening of second recess 1121.

A notch 115 for installing the driven wheel 142 into the seat 11 is formed on the sidewall of the seat 11, and after the driven wheel 142 is installed into the seat 11, the coupling shaft 151 penetrates through the second through hole 114 and sequentially penetrates through the driven wheel 142, the second bracket 112 and the third bearing 1513. Since the diameter of the driven wheel 142 is larger than the diameter of the second through hole 114, in order to facilitate the installation of the driven wheel 142, a notch 115 is required to be formed in the sidewall of the housing 11 to receive the driven wheel 142, after the driven wheel 142 is received, the coupling shaft 151 is inserted, and then the third bearing 1513 is installed on the back of the second bracket 112 opposite to the driven wheel 142, thereby reducing the difficulty in installing the bearing.

The second bracket 112 is connected across two opposite sidewalls of the housing 11, and the first bracket 111 is formed by extending the bottom wall of the housing 11 upward. The first carrier 111 is stronger than the second carrier 112, and since the first carrier 111 is to support the drive shaft 131 on the planetary gear mechanism 13 and the second carrier 112 supports the coupling shaft 151, the first carrier 111 requires greater structural strength.

The first bracket 111 has a connecting portion 1112 integrally connected to the sidewall of the seat body 11, and the connecting portion 1112 may be a rib or a two-step structure to improve the strength of the first bracket 111.

The utility model also provides a surface cleaning equipment, it includes handle components and scrubbing brush subassembly, and the scrubbing brush subassembly includes round brush 2 and the round brush drive arrangement 1 of drive round brush 2 rotations, and round brush drive arrangement 1 is aforementioned round brush drive arrangement 1. The surface cleaning apparatus is a floor scrubber or a vacuum cleaner or the like.

The second embodiment:

the structure of the present embodiment is substantially the same as that of the present embodiment, except that, as shown in fig. 12 and 13, in order to facilitate the installation of the driven wheel 142, the second bracket is not disposed on the seat body 11, but the second recess 1121 is disposed on the cover 16. Specifically, the cover 16 is fixed to the seat 11, the driven wheel 142 is fixed to the coupling shaft 151, the third bearing 1513 is fixed to an end of the coupling shaft 151, the cover 16 is formed with a second recess 1121, and the third bearing 1513 is inserted and fixed into the second recess 1121. Also, the cap plate 16 has a strength suitable for resisting the force applied from the coupling shaft 151 to maintain the operational stability of the coupling shaft 151. In the present embodiment, since the mounting structure of the coupling shaft 151 is stable, the operation stability of the coupling shaft 151 can be maintained without providing a second bracket. Since other structures of this embodiment are substantially the same as those of the first embodiment, detailed descriptions thereof are omitted.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A rolling brush driving device comprises a shell, a motor, a planetary wheel mechanism, a belt transmission mechanism and a rolling brush coupler for coupling a rolling brush; the motor transmits the rotary power to the rolling brush coupler through the planetary wheel mechanism and the belt transmission mechanism; the planetary gear mechanism is provided with a driving shaft extending into the shell, and the rolling brush coupler is provided with a coupling shaft extending into the shell; the driving wheel of the belt transmission mechanism is fixedly connected to the driving shaft, and the driven wheel of the belt transmission mechanism is fixedly connected to the coupling shaft; the method is characterized in that:

the shell comprises a base body and a cover plate, a mounting cavity is formed between the cover plate and the base body, and the driving shaft comprises a first end part extending into the mounting cavity from one side of the base body;

the base body is provided with:

a first bracket for positioning the first end portion and configured to allow rotation of the drive shaft but restrict movement of the drive shaft;

the first bracket is integrally jointed with the base body, so that the first bracket has the strength for keeping the driving shaft to stably operate.

2. The brush drive unit according to claim 1, wherein the first end portion has a first bearing engaged thereto, the first holder has a first recess formed therein for positioning the first bearing, and an opening of the first recess into which the first bearing is fitted is provided toward the drive pulley.

3. The roller brush driving device according to claim 1, wherein the coupling shaft has a third end portion extending into a housing, the housing being provided with a second bracket for positioning the third end portion, and the second bracket being adapted to limit the movement of the coupling shaft;

wherein the second bracket is integrally engaged with the housing such that the second bracket has a strength to maintain the stable operation of the coupling shaft.

4. A roller brush drive according to claim 1, characterized in that the planetary wheel mechanism comprises a sun wheel, a set of planetary wheels rotating around the sun wheel and a planet carrier for positioning the set of planetary wheels, the drive shaft being detachably engaged on the planet carrier for taking rotational power.

5. The roller brush drive arrangement of claim 4, wherein the drive pulley is disposed between the first carrier and the planet carrier.

6. The rolling brush driving device according to claim 4, wherein the planetary gear set, the sun gear and the planetary carrier are disposed outside the seat, and the driving wheel is disposed inside the seat.

7. The roller brush drive of claim 4, wherein the first end portion has a first bearing engaged thereto, and the housing is provided with a first aperture through which the first bearing and the drive wheel pass.

8. The brushbrush drive of claim 7, wherein the drive shaft has a second bearing thereon, the second bearing having an outer diameter greater than the first aperture to seat the second bearing against the outer wall of the first aperture after the first bearing and the drive wheel pass through the first aperture.

9. A roller brush drive arrangement according to claim 8, wherein the drive shaft has a second end projecting from the second bearing, the second end being keyed to the planet carrier.

10. The rolling brush drive device according to claim 4, wherein the planetary gear mechanism further comprises a housing fixedly connected to an outer side of the base, and the planetary gear set, the sun gear and the planet carrier are all disposed in the housing.

11. A brush drive according to claim 3, wherein the coupling shaft is provided with a coupling portion at an end thereof opposite to the third end portion, the coupling portion being adapted to couple the brush.

12. The rolling brush driving device according to claim 11, wherein a second through hole is formed in a bottom wall of the housing for passing the third end of the coupling shaft therethrough, so that the third end is inserted from an outer side of the housing to an inner side of the housing.

13. The rolling brush driving device according to claim 12, wherein the driven wheel is fixed to a portion of the coupling shaft located inside the housing, and the diameter of the driven wheel is larger than the second through hole.

14. The brushroll drive apparatus of claim 13, wherein a third bearing is engaged on the third end, a second recess for locating the third bearing is formed on the second bracket, the opening of the second recess into which the third bearing is fitted being disposed away from the driven wheel.

15. The roller brush driving device according to claim 14, wherein the housing has a notch formed therein for receiving the driven wheel into the mounting cavity, and after the driven wheel is received in the mounting cavity, the coupling shaft is inserted through the second through hole and sequentially passes through the driven wheel, the second bracket and the third bearing.

16. A roller brush drive according to claim 3 or 15 wherein the second bracket bridges two opposing side walls of the housing.

17. The roller brush driving device according to claim 13, wherein a third bearing is coupled to the third end portion, a third recess for positioning the third bearing is formed in the housing, and an opening of the third recess for receiving the third bearing is disposed toward the driven wheel.

18. The brush drive of claim 1 or 2, wherein the first bracket is formed by extending upward from a bottom wall of the housing.

19. The roller brush drive of claim 18, wherein the first bracket has a coupling portion integrally engaging a sidewall of the housing.

20. A surface cleaning apparatus comprising a handle assembly and a floor brush assembly, the floor brush assembly comprising a roller brush and a roller brush drive arrangement for driving the roller brush in rotation, wherein the roller brush drive arrangement is as claimed in claims 1 to 19.