DE102015117922A1 - Cleaning device with a driven, rotatable brush body - Google Patents

Abstract

The invention relates to a cleaning device, in particular a front attachment for a vacuum cleaner, with a driven, rotatable brush body (6), a pivot bearing (10), in which a connected to the brush body shaft (11) is mounted, a fixed damping element (12) soft elastic plastic, preferably rubber, with a recess (12.1) in which the pivot bearing (10) is received, wherein the brush body (6) is provided with an annular flange (6.3) which rotates together with the brush body and one with the damping element (12) connected annular collar (13) is surrounded, wherein the annular flange (6.3) and the collar (13) define an annular gap (14) whose radial width is less than 5 mm, preferably less / equal to 3 mm, wherein the collar (13) made of metal or plastic whose hardness is preferably at least 85 Shore A, preferably at least 90 Shore A, more preferably at least 95 Shore A is made. Due to the damping element (12), the cleaning device according to the invention is characterized by a low-vibration, low-noise performance, while the compared to the damping element (12) dimensionally stable or at least significantly more dimensionally stable collar (13) widening of the small annular gap (14) and thus retraction Of threads and hair in the storage area of the brush body (6) largely prevented.

Description

The invention relates to a cleaning device with a driven, rotatable brush body, and a pivot bearing, in which a shaft connected to the brush body is mounted. The cleaning device according to the invention may in particular be designed as an attachment for a vacuum cleaner, wherein the brush body is preferably driven by means of an electric motor.

In order to reduce vibrations and / or noise caused by the rotating brush body or to dampen their transmission to the chassis of the cleaning device, the cleaning device according to the invention comprises a fixed damping element made of soft elastic plastic, preferably rubber, which is provided with a recess in which Swivel bearing is added.

To protect the pivot bearing against penetration of hair and threads of the brush body is provided with an annular flange which is rotated together with the brush body and surrounded by an associated with the damping element annular collar, wherein the annular flange and the non-rotating collar define an annular gap. The annular gap is relatively small. Its radial width (gap width) may be, for example, in the range of 0.8 to 3.0 mm. The minimum radial gap width depends on the dimensional tolerances of the collar and the annular flange arranged therein. Through a small annular gap between the rotating annular flange and the fixed collar penetration of threads and hair and various other dirt particles in the storage area is largely prevented.

Experiments have shown that even with a very small annular gap but sometimes threads and hair are pulled into the storage area and melt there due to frictional heat. A melting of threads and / or hair in the storage area can significantly affect the rotatability of the brush body. In particular, this can significantly increase the energy consumption of the motor driving the brush body.

Based on this, the invention has the object to improve a cleaning device of the type mentioned in that it is characterized by a relatively low-vibration, low-noise performance and that in him a melting of threads and hair in the storage area of the brush body is largely prevented.

This object is achieved by a cleaning device having the features specified in claim 1. Preferred and advantageous embodiments of the cleaning device according to the invention are specified in the subclaims.

The cleaning device according to the invention has a fixed damping element of soft elastic plastic, preferably rubber. In a recess of the damping element, the pivot bearing is accommodated, in which the shaft connected to the brush body is mounted. The brush body is provided with an annular flange which rotates together with the brush body and is surrounded by an annular collar connected to the damping element, the annular flange and the collar defining an annular gap whose radial width is less than 5 mm, preferably less than or equal to 3 mm is. According to the invention, the collar is made of metal or plastic whose hardness is preferably at least 85 Shore A, preferably at least 90 Shore A, particularly preferably at least 95 Shore A.

The collar thus has a relatively high dimensional stability. In this way it can be ensured that the radial width of the annular gap between the rotating annular flange and the non-rotating collar remains largely constant even at high rotational speed of the brush body. An enlargement of the gap by radial expansion of the collar should be at least largely prevented. Due to the small, preferably minimal gap between the rotating annular flange and dimensionally stable, non-rotating collar penetration of filaments, hair and other dirt particles in the storage area is largely prevented. At the same time, the transmission of vibrations from the rotating brush body to the chassis or housing of the cleaning device is significantly reduced by the damping element made of soft elastic plastic.

An optimal dimensional stability of the collar results in particular when this is made according to an advantageous embodiment of the invention made of aluminum or an alloy based on aluminum. The collar is also characterized in this case by a low weight, which is in view of a low weight of the cleaning device and a comfortable handling of the same advantage.

In order to achieve very good damping or decoupling properties, a further preferred embodiment of the invention provides that the plastic of the damping element has a hardness of less than or equal to 82 Shore A, preferably less than or equal to 80 Shore A, particularly preferably less than or equal to 75 Shore-A has.

The determination of the Shore hardness A can according to DIN ISO 7619-1 respectively. This is a one used truncated conical tip having steel pin which is pressed with a certain contact weight in the material to be tested. The indentation depth (also called penetration depth or indentation hardness) is measured on a scale of 0-100.

A further advantageous embodiment of the invention is characterized in that at least one circumferential inner surface segment of the collar facing the annular flange has a smooth surface with a mean roughness Ra smaller than or equal to 1.0 μm, preferably smaller than or equal to 0.8 μm. By this configuration, adhesion or entrapment of threads, hair and other dirt particles can be largely prevented. The exposed inner surface of the collar preferably has substantially completely a smooth surface with a mean roughness Ra of less than or equal to 1.0 μm, preferably less than or equal to 0.8 μm. This can be better counteracted a toe-in of threads, hair and other dirt particles. The smooth surface particularly preferably has a mean roughness Ra in the range from 0.7 μm to 0.02 μm, preferably in the range from 0.5 μm to 0.02 μm. The smooth surface of the collar can be obtained, for example, by grinding, polishing and / or lapping the collar.

The mean roughness Ra - also called the arithmetic mean roughness Ra - is a roughness parameter that is used in the DIN EN ISO 4287 is defined. The average roughness Ra is the arithmetic mean of the values of the ordinate values of the roughness profile within a defined measurement distance. In other words, the average roughness Ra is the arithmetic average of all deviations of the roughness profile from the middle line of the measurement path.

In particular, tactile measuring devices can be used to determine the average roughness Ra. The tactile measuring devices work according to the stylus method and typically include an inductive transducer. A stylus with a stylus tip, usually a diamond tip, moves over the surface to be measured. The stroke of the probe tip is converted into an electrical signal. The measuring signals are read by means of a digital / analog converter in an evaluation device, such as a computer. There, the determination of the waviness and the roughness profile as well as the calculation of the average roughness Ra are carried out by digital filtering.

According to a further embodiment of the invention, the collar and the damping element are positively and / or non-positively connected. This is advantageous in terms of manufacturing and assembly of the two parts. Because so can be dispensed with a complex gluing or welding of the two parts.

A positive and / or non-positive connection of collar and damping element, however, can be performed easily, quickly and reliably.

In this context, a further preferred embodiment of the invention provides that the collar has at its end facing away from the brush body a plurality of resilient latching tongues which engage in recesses formed on the outer circumference of the damping element. This embodiment allows a particularly simple and fast execution of a reliable connection of collar and damping element. In a further embodiment, it can be provided that the respective latching tongue preferably has a latching lug projecting radially inwards, wherein the recesses formed on the outer circumference of the damping element contain recesses associated with the latching lugs.

Also, it is favorable for the mounting of the composite of collar and damping element bearing part, if according to a further preferred embodiment, the respective latching tongue on the outside a running in the circumferential direction of the collar recess, z. B. has groove or bead. The grooves or beads can be used for the positive and / or non-rotating connection of the composite storage part.

Alternatively or additionally, the damping member and / or the collar may be provided with an anti-rotation, which is formed for example by one or more cams and the respective cam associated, provided in the housing (chassis) and / or in a bottom plate of the cleaning device recess.

A further advantageous embodiment of the invention is characterized in that the brush body facing the front edge of the collar is formed as a cutting edge. In this way, an accumulation of threads and hair can also be prevented at the bearing, since otherwise occurring threads and hair are previously severed by means of the cutting edge. A cutting edge for severing threads and hair can be realized in a simple and reliable manner in that the end face of the collar facing the brush body is chamfered in a sharp-edged manner.

The invention will be explained in more detail with reference to an exemplary embodiments illustrative drawing. Show it:

1 a vacuum cleaner with a trained as an attachment cleaning device, which has an electrically driven brush body, in a perspective view;

2 a cleaning device according to 1 (without connecting piece) in a perspective bottom view;

3 a section of the cleaning device off 2 in a vertical sectional view, with one end of the brush body and its storage;

4 a cap-shaped receiving unit for receiving a rotary bearing for the brush body, in a perspective view; and

5 the recording unit 4 in another perspective view.

In 1 is a vacuum cleaner 1 pictured, which is a floor nozzle 2 with a suction mouth 3 having. The suction mouth 3 is via a suction channel and a hinged connection piece 4 on a suction pipe of the vacuum cleaner 1 connected. The floor nozzle 2 represents a cleaning device in the form of a header. At the rear end of the floor nozzle 2 are rollers 5 arranged between which the connecting piece 4 is stored. In the suction mouth 3 the floor nozzle 2 is a roller-shaped brush body 6 arranged, which by means of a motor (not shown), preferably electric motor is driven. The motor shaft is via a gearbox 7 , preferably a toothed belt transmission, with the brush body 6 coupled.

In 2 is a floor nozzle 2 (without connecting piece), which is essentially the floor nozzle 1 corresponds, shown in bottom view. The suction mouth 3 the floor nozzle 2 is elongated and extends almost the entire width of the floor nozzle 2 , The one in the suction mouth 3 arranged brush body 6 , which can also be referred to as a round brush, is held at its ends in pivot bearings in the housing or chassis 15 the floor nozzle 2 are included. At one of the two pivot bearings is the gearbox 7 with the brush body 6 coupled. The opening of the suction mouth 3 is by a removable bottom plate 8th limited, for cleaning purposes of the brush body 6 and / or the suction mouth 3 from the housing (chassis) 15 the floor nozzle 2 can be removed. The bottom plate 8th For this purpose, preferably via releasable locking elements 9 with the housing 15 connected.

The construction of the gearbox 7 turned away pivot bearing 10 will now be based on the 3 to 5 explained. The brush body 6 has a rod-shaped body 6.1 which is provided with radially projecting bristles. Here are a variety of bristles to individual bristle tufts 6.2 summarized and the bristle tufts 6.2 preferably helically strung together. The main body is preferably made of plastic, wherein the bristles or bristle tufts 6.2 with one of its ends cohesively with the body 6.1 are connected. The cohesive connection can be realized for example by molding the bristle ends with liquid plastic material.

The main body 6.1 the round brush 6 is with a wave 11 provided facing the end of the main body 6.1 projects axially. The wave 11 defines the axis of rotation of the brush body 6 and is torsionally rigid with the main body 6.1 connected. This is an axial section of the shaft 11 positive and / or cohesive with the body 6.1 connected. The wave 11 is preferably made of metal, for example made of steel.

The wave 11 is in the pivot 10 stored, which is designed as a plain bearing. The pivot bearing 10 is preferably formed as a spherical cap, which is made for example of brass or another metal, which is characterized by good sliding properties with respect to the shaft 11 distinguished.

The pivot bearing 10 is via a damping element 12 in the case or chassis 15 of the cleaning device 2 held. For this purpose, the damping element 12 a recess 12.1 for positive reception of the pivot bearing 10 on. The recess 12.1 is inside by a dome-shaped stop surface 12.2 limited and has at her the brush body 6 facing estuary a circumferential narrowing 12.3 on. The damping element 12 is made of soft elastic material, preferably made of rubber, for example of ethylene-propylene-diene rubber. It serves for the vibration decoupling of the rotating brush body 6 opposite the case or chassis 15 of the cleaning device 2 , The plastic of the damping element 12 For example, has a hardness less than or equal to 82 Shore A, preferably less than or equal to 80 Shore A on the damping element 12 may also be referred to as a soft component.

To prevent threads or hair during operation of the cleaning device 2 penetrate into the storage area and melt there due to high frictional heat, the storage area is through an annular flange 6.3 and an annular, the annular flange 6.3 surrounding collar 13 shielded. The ring flange 6.3 is with the brush body 6 connected so that he rotates together with this. The ring flange 6.3 is radially opposite the main body 6.1 of the brush body and is preferably integral with the body 6.1 formed. The ring flange 6.3 has a circular outer circumference and is coaxial with the shaft 11 or axis of rotation of the brush body 6 arranged.

The annular collar 13 is with the damping element 12 connected. Together they form a cap-shaped receiving unit, which can also be called from the camp cap. The ring flange 6.3 and the non-rotating collar 13 define an annular gap 14 whose radial width is less than 5 mm, preferably less than or equal to 3 mm, for example in the range of 0.8 mm to 1.5 mm. Ideally, the radial width of the annular gap 14 minimally executed. The collar 13 is sized so that he has the ring flange 6.3 axially in the direction of the brush body 6 overlaps. The ring flange 6.3 facing side 12.4 of the damping element 12 is essentially just trained. Likewise, the the damping element 12 facing side of the annular flange 6.3 essentially flat.

So that the annular gap 14 during operation of the cleaning device 2 as constant as possible remains small, and is not significantly widened by threads, hair or other dirt particles, is the collar 13 designed dimensionally stable and this made of metal or plastic whose hardness is at least 85 Shore A, preferably at least 90 Shore A, more preferably at least 95 Shore A made. The soft elastic damping part 12 and the collar formed as a closed ring 13 are therefore made separately from each other. If the collar 13 is made of metal, it is preferably the metal is aluminum or an alloy based on aluminum.

As in the 3 to 5 It can be seen, are the collar 13 and the damping element 12 positively and non-positively connected. The collar 13 has this at his the brush body 6 opposite end a plurality of resilient locking tongues 13.1 on, in on the outer circumference of the damping element 12 trained recesses 17 intervention. The locking tongues 13.1 and their associated recesses 17 are spaced apart, preferably evenly over the outer periphery of the damping element 12 or of the annular collar 13 arranged distributed. The respective latching tongue 13.1 has a latching nose projecting radially inwards 13.2 , Wherein on the outer circumference of the damping element 12 trained recesses 17 the locking lugs 13.2 associated wells 12.6 exhibit. Furthermore, it can be seen that the respective latching tongue 13.1 on the outside one in the circumferential direction of the collar 13 extending depression 13.3 , z. B. has a groove or bead.

The brush body 6 opposite end face of the damping element 12 is stepped. In the embodiment shown here has the damping element 12 at the brush body 6 opposite end face two steps (paragraphs), the two annular surface sections 12.7 . 12.8 define. Furthermore, the end face with an axial, annular projection 12.9 provided coaxially with the central axis of the pivot bearing 10 receiving recess 12.1 or to the axis of rotation of the brush body 6 is arranged. The lead 12.9 engages positively in a recess on the inside of the housing wall 15.1 of the cleaning device 2 is trained. With 16 is one on the bottom plate 8th attached sealing lip refers to the sealing at the lower edge of the housing wall 15.1 is applied.

The between the locking tongues 13.1 of the collar 13 lying radial projections (cams) 12.5 of the damping element 12 define a cam geometry for mounting the damping element 12 and collar 13 assembled unit in one through the chassis 15 and the bottom plate 8th limited admission. The made of damping element 12 and collar 13 assembled unit (bearing cap) has, which is not shown in detail in the accompanying drawing, via a rotation, which is formed for example by a cam and a housing and / or bottom plate side recess.

In order to prevent adhesion of hair, threads and various other dirt particles at the bearing, sees a further embodiment of the bearing cap ( 12 + 13 ) that at least one of the annular flange 6.3 facing, circumferential inner surface segment of the collar 13 has a smooth surface with a mean roughness Ra less than or equal to 1.0 microns, preferably less than or equal to 0.8 microns. Preferably, the exposed inner surface has 13.4 of the collar 13 Overall, a smooth surface with a mean roughness Ra less than or equal to 1.0 microns, preferably less than or equal to 0.8 microns. The surface in question can be smoothed in particular by grinding and / or polishing. In this way, for example, in particular on the inner surface 13.4 of the collar 13 a smooth surface can be achieved whose average roughness Ra is in the range of 0.7 μm to 0.02 μm, preferably in the range of 0.5 μm to 0.02 μm.

In addition or as an alternative to the smooth surface, the brush body 6 facing front edge 13.5 of the collar 13 be designed as a cutting edge to prevent accumulation of hair or threads at the bearing. For this purpose, the front edge 13.5 sharp-edged (see in particular 3 ).

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• DIN ISO 7619-1 [0011]
• DIN EN ISO 4287 [0013]

Claims (12)

Cleaning device ( 2 ) with a driven, rotatable brush body ( 6 ), a pivot bearing ( 10 ) in which a shaft connected to the brush body ( 11 ), a fixed damping element ( 12 ) made of soft elastic plastic, preferably rubber, with a recess ( 12.1 ), in which the pivot bearing ( 10 ), wherein the brush body ( 6 ) with an annular flange ( 6.3 ), which together with the brush body ( 6 ) and from one with the damping element ( 12 ) associated annular collar ( 13 ), wherein the annular flange ( 6.3 ) and the collar ( 13 ) an annular gap ( 14 ) whose radial width is less than 5 mm, preferably less than or equal to 3 mm, wherein the collar ( 13 ) made of metal or plastic, whose hardness is preferably at least 85 Shore A, preferably at least 90 Shore A, more preferably at least 95 Shore A is made. Cleaning device: according to claim 1, characterized in that the collar ( 13 ) is made of aluminum or an alloy based on aluminum. Cleaning device according to claim 1 or 2, characterized in that the plastic of the damping element ( 12 ) has a hardness of less than or equal to 82 Shore A, preferably less than or equal to 80 Shore A, particularly preferably less than or equal to 75 Shore A. Cleaning device according to one of claims 1 to 3, characterized in that at least one of the annular flange ( 6.3 ) facing, circumferential inner surface segment of the collar ( 13 ) has a smooth surface with a mean roughness Ra less than or equal to 1.0 microns, preferably less than or equal to 0.8 microns. Cleaning appliance according to one of claims 1 to 4, characterized in that the exposed inner surface ( 13.4 ) of the collar ( 13 ) substantially completely has a smooth surface with a mean roughness Ra smaller than or equal to 1.0 μm, preferably smaller than or equal to 0.8 μm. Cleaning appliance according to claim 4 or 5, characterized in that the smooth surface has a mean roughness Ra in the range of 0.7 microns to 0.02 microns, preferably in the range of 0.5 microns to 0.02 microns. Cleaning appliance according to one of claims 1 to 6, characterized in that the collar ( 13 ) and the damping element ( 12 ) are positively and / or non-positively connected. Cleaning device according to one of claims 1 to 7, characterized in that the collar ( 13 ) at its the brush body ( 6 ) facing away from a plurality of resilient latching tongues ( 13.1 ), which in on the outer circumference of the damping element ( 12 ) formed recesses ( 17 ) intervene. Cleaning device according to claim 8, characterized in that the respective latching tongue ( 13.1 ) a radially inwardly projecting latching lug ( 13.2 ), wherein on the outer circumference of the damping element ( 12 ) formed recesses ( 17 ) the locking lugs ( 13.2 ) associated wells ( 12.6 ) contain. Cleaning device according to claim 8 or 9, characterized in that the respective latching tongue ( 13.1 ) on the outside a running in the circumferential direction of the collar recess ( 13.3 ) having. Cleaning appliance according to one of claims 1 to 10, characterized in that the brush body ( 6 ) facing front edge ( 13.5 ) of the collar ( 13 ) is formed as a cutting edge. Cleaning appliance according to one of claims 1 to 11, characterized in that the brush body ( 6 ) facing front edge ( 13.5 ) of the collar ( 13 ) is sharp-edged.

Images