EP3361924B1 - Surface cleaning machine - Google Patents

Description

The invention relates to a surface cleaning machine, comprising a device body with a housing, a suction unit device with a fan, which is arranged in the housing, a cleaning head, which is arranged on the device body outside of the housing, comprises at least one cleaning roller and is fluidly active with the suction unit device connected, an air-cooled drive motor for driving the at least one cleaning roller in rotation, a process air ducting device for process air of the suction unit device, with the drive motor being arranged outside the housing of the device body, and a cooling air ducting device for cooling air of the drive motor, which has at least one fluid path which is on or in is arranged in the housing, wherein the cooling air guiding device is coupled to the process air guiding device and wherein the cooling air guiding device has a cooling air inlet and a cooling air outlet and the process air guiding device has a process air inlet and a process air outlet.

The EP 2 064 979 A1 discloses an electric suction head for a vacuum cleaner.

The GB 2 435 820A discloses a vacuum cleaner with a cleaning head.

The WO 02/28251 A2 also discloses a vacuum cleaner.

From the WO 2013/027140 A1 a cleaning device for cleaning a surface is known, which comprises a rotatable brush. There is also a squeegee element spaced from the brush and secured to an underside of a nozzle housing.

From the WO 2013/027164 A1 also discloses a cleaning device having a rotatable brush and a single squeegee element.

From the EP 2 177 128 A1 a device for distributing fluid on a brush is known.

From the DE 41 17 157 A1 a method for cleaning or cleaning a preferably smooth surface is known, in which the surface to be cleaned is wiped with an essentially rag-like wiping element, the dirt being picked up by the wiping element and then the soiled wiping element is moistened and the dirt is then sucked off the wiping element becomes.

From the WO 2010/140967 A1 a method for cleaning a soiled surface is known.

From the CH 607 578 a brush device which can be connected to a water pipe is known.

From the EP 0 186 005 A1 a brush suction nozzle provided with impellers is known.

From the FR 2 797 895 a brush is known.

From the U.S. 2002/0194692 A1 a method for mechanical dirt removal from a surface is known.

From the WO 2013/11789 A1 a cleaning head for a vacuum cleaner is known.

From the U.S. 6,400,048 B1 there is known a rotating brush device in which a motor is disposed at a first end of a cylindrical body and a speed reduction mechanism is disposed at a second end of the cylindrical body. An electric fan is arranged outside the cylindrical body and serves to blow air into the cylindrical body to cool the motor.

The object of the invention is to provide a surface cleaning machine of the type mentioned at the outset, which has a high level of splash water resistance with a simple structural design.

In the case of the surface cleaning machine mentioned at the outset, this object is achieved according to the invention in that a moistening device is provided for moistening the at least one cleaning roller with cleaning liquid, that the cooling air outlet and the process air outlet coincide, that the process air inlet is controlled by one or more Suction mouths is formed on the cleaning head, and that the cooling air inlet is spaced from the process air inlet and arranged in a cleaning operation of the surface cleaning machine is positioned above the process air inlet in relation to the direction of gravity.

The drive motor is air-cooled. A cooling air guide device, which has at least one channel through which the at least one fluid path is formed and which is arranged on or in the housing, can provide a cooling air inlet or cooling air outlet at a large distance from the at least one cleaning roller and in particular on and preferably in an upper area of the housing. As a result, a high level of splash water protection can be obtained for the area of the cleaning head. The number of (air) openings on the cleaning head or in the vicinity of the cleaning head can be kept small.

If the cooling air guiding device is coupled to the process air guiding device, then fluid paths or openings can be used jointly for cooling air and process air. The number of inlets and outlets can be reduced.

Furthermore, the suction unit device can be used to suck in cooling air from the cooling air guiding device.

It is particularly advantageous if the process air guiding device and the cooling air guiding device have at least one common fluid path. As a result, for example, an outlet and/or an inlet can be used jointly for cooling air and process air. With a simple structural design of the surface cleaning machine, there is a high level of splash water resistance.

The cooling air guiding device has a cooling air inlet and a cooling air outlet, the process air guiding device has a process air inlet and a process air outlet, and the cooling air outlet and the process air outlet coincide. As a result, the number of inlets and outlets and thus the number of air openings can be kept low. This results in a high degree of splash water protection for the surface cleaning machine.

For the same reason, it is favorable if the process air outlet forms the cooling air outlet and/or the process air inlet forms the cooling air inlet.

In one embodiment, a cooling air inlet is provided, a process air inlet is provided and a common outlet is provided for cooling air and process air. The cooling air inlet and the process air inlet are separate from each other. As a result, only two inlets and one outlet in total have to be provided for cooling air and process air.

It is favorable if the cooling air inlet is arranged on the cleaning head or on a transition area from the cleaning head to the housing of the device body. This results in a short route for supply air cooling air to the drive motor.

The process air inlet is formed by one or more suction openings on the cleaning head.

The cooling air inlet is arranged at a distance from the process air inlet and is positioned above the process air inlet in relation to the direction of gravity, in particular during cleaning operation of the surface cleaning machine. This results in an optimized ability to be coupled in and, in particular, to be able to suck in supply air cooling air.

In one exemplary embodiment, the process air outlet is arranged on the device body and in particular on the housing of the device body and in particular arranged at a distance from the cleaning head and in particular arranged at a distance from the drive motor. As a result, process air can be released into the environment at a relatively large distance from the at least one cleaning roller. With a corresponding coupling of the cooling air guiding device, exhaust air cooling air can also be discharged to the environment there.

In one embodiment, the drive motor is arranged in a motor housing. The motor housing can be used to guide the flow of cooling air.

In particular, the cooling air guiding device has at least one fluid path through the motor housing and preferably through the drive motor. In this way, optimized air cooling of the drive motor can be achieved.

It is favorable if the motor housing is arranged in a sleeve. A joint can be formed via the sleeve, for example as an inner sleeve, via which the cleaning head can be pivoted relative to the device body. The sleeve can also be used to guide the flow. In particular, a wall (and also a wall of a motor housing) can be used as a wall of one or more flow channels. This results in a simple structural design with easy manufacturability of the surface cleaning machine and high splash protection.

In particular, the cooling air guiding device has at least one fluid path, which lies along the sleeve and/or between the sleeve and the or a motor housing. As a result, supply air flow ducts for supply air cooling air to the drive motor can be implemented in a simple manner.

In particular, the cooling air guiding device has a first fluid path, which runs along the sleeve and is located on an outer side of the sleeve, and has a second fluid path, which runs along the sleeve on an inner side of the sleeve facing the motor housing. This results in an optimized ability to supply cooling air to the drive motor with a simple structural design.

In particular, the motor housing extends along an axial direction (which in particular coincides with a drive axis of the drive motor) between a first end and a second end and a The cooling air inlet of the cooling air guiding device is positioned between the first end and the second end on the surface cleaning machine in relation to the axial direction. In relation to the axial direction, the cooling air inlet is positioned at the height of the motor housing. This results in an optimized feedability of supply air cooling air to the drive motor with high splash water protection.

It is favorable if the cleaning head can be pivoted relative to the drive motor and, in particular, can be pivoted relative to a sleeve, with the sleeve in particular forming a pivot bearing element. As a result, corner regions can be cleaned in an advantageous manner, for example because the device body can be pivoted relative to the at least one cleaning roller. The sleeve, in turn, can be used, for example, to guide the flow of the cooling air guiding device. It is also possible, for example, to fix the drive motor to the device body via the sleeve and to position it outside of the housing.

In particular, the sleeve is non-rotatably connected to the device body. In this way, a swivel bearing can be implemented in a simple manner with the cleaning head being able to rotate relative to the device body.

In an advantageous embodiment, the cooling air guiding device is coupled to a suction area of the process air guiding device. A corresponding negative pressure prevails in the suction area of the process air guiding device. This is generated by a fan of the suction unit device. This negative pressure can be used to drive cooling air through the cooling air guiding device. As a result, for example, no fan has to be provided for the drive motor in order to drive cooling air through the cooling air guiding device. This results in a structurally simple construction of the surface cleaning machine, wherein in comparison to a drive motor that has to drive a fan, the corresponding drive motor can be dimensioned with less power and thus with a lower mass.

In particular, at least one fluid path of the cooling air guiding device opens into at least one suction path of the process air guiding device. This advantageously allows exhaust air from the cooling air ducting device to be coupled into the process air ducting device, with active cooling of the drive motor being able to be implemented and the necessary suction flow being generated by the fan of the suction unit device that is present anyway.

In particular, the at least one suction path has at least one rib, which is assigned to an opening of the at least one fluid path of the cooling air guiding device into the at least one suction path. The at least one rib is arranged in the suction path in such a way that it is effective in preventing liquid droplets from the suction flow from penetrating into the cooling air guiding device. In principle, the suction flow in the at least one suction path, into which the at least one fluid path of the cooling air guiding device is coupled, can still contain liquid droplets, liquid droplets basically being able to get from the at least one suction path into the cooling air guiding device. By providing the at least one rib, which is arranged in particular in front of an opening of the at least one fluid path of the cooling air guiding device into the at least one suction path, at least a large part of liquid droplets can be prevented from penetrating into the cooling air guiding device. The at least one rib acts to a certain extent as a screen.

In order to prevent drops of liquid from penetrating into the cooling air guiding device, it is also advantageous if a blocking element for droplets penetrating from the at least one suction path into the cooling air guiding device is arranged at an opening of the cooling air guiding device into the at least one suction path. The blocking element serves to prevent or at least reduce the ingress of drops.

In one embodiment, the locking element has an area with which it protrudes into the at least one suction path, and is in particular as a Tube (tube) formed and has in particular an orifice which is oriented obliquely to a main flow direction in the at least suction path. In particular, the at least one orifice opening is oriented at an acute angle to the main flow direction in such a way that it "recedes", i.e. the distance between the orifice opening and the main flow direction decreases relative to the main flow direction. In particular, the blocking element is designed as a tube or tube, for example made of a rubber material. The blocking element has a projection beyond the area protruding into the at least one suction path, which reduces the risk of droplets penetrating.

It is also advantageous if at least one discharge channel for liquid opens into the at least one suction path, which in particular leads from a junction area of the cooling air guiding device into the at least one suction path to a collecting device for liquid. Liquid which would otherwise accumulate in this area of the suction path (in particular due to at least one rib and/or a blocking element which are at least partially positioned in this area) can drain off via the at least one drainage channel. The collection device is then, for example, a tank device for dirty liquid or a separator. The at least one discharge channel prevents liquid from accumulating in the relevant area, which in turn could then get into the cooling air guiding device.

In particular, the at least one fluid path of the cooling air guiding device, which opens into at least one suction path of the process air guiding device, is arranged downstream of the drive motor with regard to a cooling air flow. As a result, exhaust cooling air from the drive motor, ie cooling air which has flowed through the drive motor or has flowed past it and has been heated, can be discharged in an optimized manner.

In particular, the at least one suction path of the process air guiding device is in which the at least one fluid path of the cooling air guiding device opens, with respect to a suction air flow upstream of the blower and in particular upstream of a separator or downstream of the separator. By connecting upstream of the fan, a suction flow of the fan can be used to provide a cooling air suction flow, which drives cooling air through the cooling air guiding device. If a separator is installed downstream, the flow of cooling air does not have to flow through the separator.

The suction unit device advantageously has a blower motor for the blower, which is arranged on the housing. This drives one or more turbine wheels of the fan in order to generate a suction flow, through which an area on the at least one cleaning roller can be sucked off. Furthermore, a negative pressure can be applied to the cooling air guiding device.

It is favorable if the drive motor is positioned on the cleaning head or is positioned at a transition area from the cleaning head to the housing. As a result, it can be positioned at a relatively low point on the surface cleaning machine in relation to a normal mode of cleaning operation. This results in a simple mode of operation for an operator.

It is favorable if a drive axis of the drive motor and a rotation axis of the at least one cleaning roller are oriented transversely and, in particular, perpendicularly to one another. This makes it possible, for example, to mount and drive the at least one cleaning roller centrally and also to achieve freedom of bearing at the edge regions of the at least one cleaning roller. As a result, a cleaning effect can also be achieved at the edge areas of the at least one cleaning roller.

It is favorable when a drive axis of the drive motor and a rotation axis of the at least one cleaning roller are oriented transversely and in particular perpendicularly to one another.

It is also favorable if a gear mechanism is provided for torque transmission from the drive motor to the at least one cleaning roller. A speed reduction can be achieved, for example, by means of the transmission device. Furthermore, an angle change with regard to the torque guidance can be achieved. A torque can be transmitted to the cleaning roller at an optimized point.

Furthermore, it is advantageous if the cleaning head is seated on the device body via a joint so that it can be pivoted about a pivot axis. This results in improved cleaning options, especially in corners and edge areas.

It is provided that the pivot axis is oriented transversely to a longitudinal axis of the device body and in particular is oriented at an acute angle to the longitudinal axis and/or that a drive axis of the drive motor is at least approximately parallel or coaxial to the pivot axis. This results in extended cleaning options, especially in corners and edge areas.

A moistening device is provided for moistening the at least one cleaning roller with cleaning liquid. The at least one cleaning roller can be moistened directly or indirectly by the moistening device. In the case of direct moistening, cleaning liquid is applied directly to the at least one cleaning roller. With indirect moistening, cleaning liquid is applied to the surface to be cleaned. The at least one cleaning roller then absorbs cleaning fluid from there. Dirt on the surface to be cleaned can be loosened with cleaning liquid and thus better absorbed.

It is also favorable if a tank device for cleaning liquid is arranged on the device body and/or a receiving device is arranged on the device body for dirt and/or a tank device for dirty liquid is arranged. This results in optimized cleaning options with a compact design of the surface cleaning machine.

It is favorable if, in a cleaning operation, the surface cleaning machine is supported on a surface to be cleaned only via the at least one cleaning roller. As a result, the surface cleaning machine can be implemented in a compact manner. Furthermore, user-friendly cleanability can be achieved. For example, an operator then only has to additionally support the surface cleaning machine during a cleaning operation at one point at a distance from the at least one cleaning roller (such as a handle).

It is also favorable if an air inlet and/or an air outlet (a cooling air inlet, a process air inlet, a cooling air outlet, a process air outlet) has one or more slots or is formed by one or more slots is. Such an inlet or outlet can be implemented in a simple manner. It has one or more openings, one opening being formed by a slit.

Figur 1

eine perspektivische Darstellung eines Ausführungsbeispiels einer erfindungsgemäßen Flächen-Reinigungsmaschine, welche für einen Reinigungsbetrieb auf einer zu reinigenden Fläche aufgesetzt ist;

Figur 2

eine Seitenansicht der Flächen-Reinigungsmaschine gemäß Figur 1;

Figur 3

eine Vorderansicht der Flächen-Reinigungsmaschine gemäß Figur 1;

Figur 4

eine Teildarstellung eines Gerätekörpers und eines Reinigungskopfes mit einem teilweise geöffneten Gehäuse des Gerätekörpers;

Figur 5

eine (Teil-)Seitenansicht längs der Linie 5-5 gemäß Figur 3;

Figur 6

eine vergrößerte Darstellung eines Bereichs um einen Antriebsmotor der Figur 5;

Figur 7

eine vergrößerte Darstellung eines Bereichs an einer Saugaggregateinrichtung der Figur 5;

Figur 8

eine schematische Darstellung einer Kühlluftführungseinrichtung für einen Antriebsmotor und einer Prozessluftführungseinrichtung einer Saugaggregateinrichtung, wenn diese nicht miteinander gekoppelt sind;

Figur 9

ein schematisches Ausführungsbeispiel einer erfindungsgemäßen Lösung, bei welcher die Kühlluftführungseinrichtung und die Prozessluftführungseinrichtung miteinander gekoppelt sind;

Figur 10

ein zweites schematisches Ausführungsbeispiel einer erfindungsgemäßen Lösung mit Kopplung der Kühlluftführungseinrichtung an die Prozessluftführungseinrichtung; und

Figur 11

ein weiteres schematisches Ausführungsbeispiel für eine relative Positionierung der Kühlluftführungseinrichtung und der Prozessluftführungseinrichtung.

The following description of preferred embodiments serves to explain the invention in more detail in conjunction with the drawings. Show it:

figure 1

a perspective view of an embodiment of a surface cleaning machine according to the invention, which is placed on a surface to be cleaned for a cleaning operation;

figure 2

a side view of the surface cleaning machine according to FIG figure 1 ;

figure 3

a front view of the surface cleaning machine according to FIG figure 1 ;

figure 4

a partial view of a device body and a cleaning head with a partially open housing of the device body;

figure 5

a (partial) side view along the line 5-5 according to FIG figure 3 ;

figure 6

an enlarged view of an area around a drive motor figure 5 ;

figure 7

an enlarged view of an area on a suction unit device figure 5 ;

figure 8

a schematic representation of a cooling air guiding device for a drive motor and a process air guiding device of a suction unit device when they are not coupled to one another;

figure 9

a schematic exemplary embodiment of a solution according to the invention, in which the cooling air guiding device and the process air guiding device are coupled to one another;

figure 10

a second schematic embodiment of a solution according to the invention with coupling of the cooling air guiding device to the process air guiding device; and

figure 11

a further schematic exemplary embodiment for a relative positioning of the cooling air guiding device and the process air guiding device.

An embodiment of a surface cleaning machine 10 according to the invention ( Figures 1 to 7 ) is designed as a floor cleaning machine for hard floors.

The surface cleaning machine 10 comprises a device body 12 and a cleaning head 14. The cleaning head 14 is arranged on the device body 12.

During a cleaning process on a surface 16 to be cleaned, the surface cleaning machine 10 is supported on the surface 16 to be cleaned via a cleaning roller 18 . In one embodiment ( figure 1 ) a single cleaning roller 18 is provided.

In principle, it is also possible for several cleaning rollers to be provided.

The device body 12 has a longitudinal axis 20 ( figures 2 , 3 ) on. The surface cleaning machine 10 is kept stealing. For this purpose, a rod 22 is seated on the device body 12. This rod 22 extends in the longitudinal axis 20. A handle 24 and in particular a loop handle is arranged on an upper region of the rod 22. An operator can hold the surface cleaning machine 10 on this handle with one hand and guide it over the surface 16 to be cleaned.

One or more operating elements are arranged on the handle 24 . In particular, a switch 26 is arranged on the handle 24 . The surface cleaning machine 10 can be switched on or off for a cleaning operation via the switch 26 .

In particular, the control of the surface cleaning machine 10 is such that by actuating the switch 26, all components necessary for the functioning (generation of a suction flow by a suction unit device, rotation of the cleaning roller 18, moistening of the cleaning roller 18 directly or indirectly) are actuated and accordingly a Turning off at switch 26 causes synchronous turning off of the actuation of these components.

The rod can be vertically displaceable along the longitudinal axis 20 or be rigid or rigidly arranged on the device body 12 .

The device body 12 includes a housing 28 in which components of the surface cleaning machine are protected.

In one exemplary embodiment, a hook device 30 is arranged on the rod 22 between the housing 28 and the handle 24, on which hook device 30 a mains cable can be fixed by wrapping it around the rod 22.

The cleaning head 14 with the cleaning roller 18 is arranged outside of the housing 28 .

The surface cleaning machine 10 comprises a suction unit device designated as a whole by 32 . This suction unit device 32 is used to generate a suction flow in order to be able to carry out suction on the cleaning roller 18 .

The suction unit device 32 includes a fan (suction fan) 34 which is arranged in the housing 28 . The fan 34 in turn is driven by a fan motor 36 . The fan motor 36 is arranged in the housing 28 . He is in particular an electric motor.

A separator 38 is assigned to the suction unit device 32 . This is also positioned in the housing 28 . The separator separates solid from liquid components in a suction flow.

A tank device 40 for dirty liquid is assigned to the separator 38 . This sits detachably on the housing 28.

A tank device 42 for cleaning liquid is also seated detachably on the housing 28 . The cleaning liquid is in particular water or a mixture of water and cleaning agent. (In figure 4 a partial view is shown with the housing 28 open and the tank device 42 removed.)

The suction unit device 32 acts fluidly on (at least) one suction channel 44 ( figure 7 ) connected, which is guided from the blower 34 on the device body 12 through the housing 28 to the cleaning head 14 .

The suction channel 44 has a first region 46 which is positioned on the housing 28 . In one exemplary embodiment, a branch (not visible in the drawings) is seated in the housing 28 at the first area 46 , which branches off to a second area 50 and a third area 52 of the suction channel 44 . The suction channel 44 is divided into two sub-channels via the junction and the second area 50 and the third area 52 . The second area 50 and the third area 52 are each led to the cleaning head 14 . The second area 50 and the third area 52 are located at least partially outside of the housing 28.

In principle, it is also possible for the branch to be located outside of the housing 28 . In this case, the second area 50 and the third area 52 in particular are located completely outside of the housing 28.

At least one suction mouth 54 is assigned to the cleaning head 14 facing the cleaning roller 18 . For example, at least one suction opening is assigned to the second area 50 and the third area 52 in each case.

A trimming 56 is arranged on the cleaning roller 18 . This is fixed in particular on a sleeve 58 which has a cylindrical shape.

In one embodiment, the at least one suction port includes a first port wall and a second spaced port wall. The respective suction mouth 54 is formed between the first mouth wall and the second mouth wall. The first mouth wall lies above the second mouth wall when the cleaning roller 18 is placed on the surface 16 to be cleaned. The first mouth wall and/or the second mouth wall are in contact with the trimming 56 of the cleaning roller 18 or protrude into the trimming 56 . A corresponding muzzle training is in the WO 2015/086083 A1 described. This document is expressly referred to in its entirety.

In principle, it is possible for the second area 50 and the third area 52 to be assigned their own suction port 54 , or a common suction port for the second area 50 and the third area 52 of the suction channel 44 can be provided. This one suction opening 54 then has two suction points via the second area 50 and the third area 52 .

In principle, the suction channel routing from the suction unit device 32 to the cleaning head 14 can also be configured without branches and can include several (in particular two) suction channels, which are then routed from the housing 28 to the cleaning head 14 .

The cleaning head 14 is held on the device body 12 outside of the housing 28 via a joint 62 so as to be pivotable about a pivot axis 64 ( figure 2 ). The pivot axis 64 is transverse to the longitudinal axis 20 of the device body 12. In particular, it is at an acute angle 66 ( figure 2 ). The acute angle 66 is in particular in the range between 15° and 35°.

In one embodiment, the acute angle 66 is about 25°.

The pivot axis 64 is transverse and in particular perpendicular to a rotation axis 68 of the cleaning roller 18.

The cleaning roller 18 has a longitudinal axis 70 . The longitudinal axis 70 is in particular coaxial to the axis of rotation 68.

The swivel joint includes an (inner) sleeve 72 ( figures 6 and 7 ), which is arranged according to the orientation of the pivot axis 64 at the acute angle 66 to the longitudinal axis 20 on the device body 12. This inner sleeve 72 is in particular rigidly fixed to the device body 12 .

The cleaning head 14 has an outer sleeve 74 which is mounted on the inner sleeve 72 . A corresponding locking device ensures that the outer sleeve 74 cannot be displaced in relation to the inner sleeve 72 in the direction of the pivot axis 64 . In one embodiment, the inner sleeve 72 has a cylindrical outer contour. The outer sleeve 74 has a cylindrical inner contour. The joint 62 is designed as a sliding joint, with the outer sleeve 74 being rotatably mounted on the inner sleeve 72 .

In principle, pivotability through a full 360° angle can be provided. In one embodiment, the pivotability is limited to a range of ±45° or ±90°, for example.

A fluid line, which forms the second area 50 and the third area 52 , is designed to be correspondingly elastic, and in particular designed as a hose, in order to enable the cleaning head 14 to be pivoted at the joint 62 .

A drive device 76 with a drive motor 78 is provided for driving the cleaning roller 18 in rotation. The drive motor 78 is in particular an electric motor.

The drive motor 78 has a motor housing 79 . In the motor housing 79 are the corresponding components of the drive motor (in particular Rotor and stator) arranged. Motor housing 79 is positioned within inner sleeve 72 .

The drive motor 78 has a motor shaft 80 . The motor shaft 80 has a drive axis 82. The drive axis 82 is parallel and in particular coaxial with the pivot axis 64.

The drive motor 78 with its motor housing 79 is seated firmly in the inner sleeve 72 and is thereby fixed to the device body 12 . It is placed at a transition from the device body 12 to the cleaning head 14; it is positioned at the hinge 62 . It is accommodated in a space-saving manner and is therefore also located on the cleaning head 14. In relation to a center of gravity of the surface cleaning machine 10, it is close to the cleaning roller 18.

The drive motor 78 is supplied with electrical energy via mains power, for example.

The drive axis 82 of the drive motor 78 and the axis of rotation 68 of the cleaning roller 18 are oriented transversely to one another and, in particular, perpendicularly to one another.

In order to transmit torque from the drive motor 78 to the cleaning roller 18, the drive device 76 includes a transmission device 84.

In one embodiment, the transmission device 84 has a speed reducer 86 . The speed reducer 86 is used to reduce a speed compared to the speed of the motor shaft 80.

The drive motor 78 is, for example, a standard electric motor which, for example, has an (initial) speed of the order of 7000 revolutions per minute. The speed reducer 86 ensures that the speed is reduced to, for example, approximately 400 revolutions per minute.

The speed reducer 86 is in particular arranged directly on the drive motor 78 , that is to say arranged next to it in the direction of the cleaning roller 18 . It can still be arranged in the inner sleeve 72 or outside of it.

In one embodiment, the speed reducer 86 is designed as a planetary gear.

The transmission device 84 of the drive device 76 also has an angular gear 88 . This ensures a torque deflection in order to cause the cleaning roller 18 to be driven with the axis of rotation 68 transverse to the drive axis 82 of the drive motor 78 . The bevel gear 88 is connected downstream of the speed reducer 86 in particular.

In one embodiment, bevel gear 88 includes one or more gears non-rotatably coupled to a corresponding shaft of speed reducer 86 . These act on a bevel gear for angle conversion.

The cleaning head 14 has a first end face 90 and an opposite second end face 92 (cf figure 1 ). A housing 94 of a cleaning roller holder 96 extends between the first end face 90 and the second end face 92. This housing 94 partially encloses a cleaning roller 18 held on it in the form of a half shell, with an encircling being such that the cleaning roller 18 has a significant A portion of their stocking 56 protrudes for a cleaning process and according to the stocking 56 can contact the surface 16 to be cleaned.

In one embodiment, a sweeping element is arranged on the housing 94 of the cleaning roller holder 96, which sweeping element is used to sweep in coarse dirt to be entrained by the cleaning roller.

A drive element 102 is arranged in a middle region 100 of the cleaning roller holder 96, which lies centrally between the first end face 90 and the second end face 92. This drive element 102 is in particular connected to a shaft 104 of the cleaning roller 18 or is this shaft 104 itself. The drive element 102 is connected in a torque-effective manner to the transmission device 84 .

In one embodiment, the drive member 102 is coupled to the angular gear 88 via a belt 106 . The drive element 102 is at a distance from the bevel gear 88. The belt 106 bridges this distance and drives the drive element and thus causes the cleaning roller 18 to rotate about the axis of rotation 68.

In one embodiment (cf figure 1 ) The cleaning roller is formed in two parts with a first part and a second part. The first part and the second part are each seated on the shaft 104, being spaced apart from one another in the middle region 100. As shown in FIG. There is no facing 56 in the central area. A gap 108 is formed on the cleaning roller 18 . This gap 108 is relatively narrow and has a much smaller width than a length of the cleaning roller 18 in the longitudinal axis 20. The belt 106 is guided in the gap 108. The belt 106 is set back with respect to an outside of the cleaning roller 18 and also with respect to a position in which the bristles 56 are compressed due to the cleaning roller 18 being placed on the surface 16 to be cleaned.

The surface cleaning machine 10 comprises a moistening device 110 for moistening the cleaning roller 18. Cleaning liquid can be applied directly or indirectly to the cleaning roller 18 via the moistening device 110. In the case of a direct application, cleaning liquid from the tank device 42 is applied directly to the cleaning roller 18 (to its trimming 56). In the case of indirect application, cleaning liquid is applied to the surface 16 to be cleaned. From the one to be cleaned The trimming 56 of the cleaning roller 18 then absorbs cleaning liquid on surface 16 . In principle, it is also possible for only direct application, only indirect application, or a combination of direct and indirect application to be provided.

In the unpublished German patent application no. 10 2014 114 809.6 of October 13, 2014 an exemplary embodiment of a moistening device is described, which is coupled to the suction unit device 32 .

In particular, the moistening device comprises at least one pressure-controlled switch which, in an open position, opens a fluid path for cleaning liquid to the at least one cleaning roller and, in a closed position, blocks the fluid path, wherein the at least one pressure-controlled switch is pressure-effectively coupled to the suction channel 44 and in a through a suction flow in the at least one suction channel caused vacuum application of the at least one pressure-controlled switch goes into the open position and / or holds the open position.

Reference is made expressly and in full to this application.

The drive motor 78 is air-cooled. A cooling air guiding device designated as a whole with 112 is provided for guiding the cooling air ( Figures 5 to 11 ).

The cooling air guiding device 112 has a cooling air inlet 114 . At this air is coupled into the surface cleaning machine for cooling the drive motor 78 .

The cooling air inlet 114 is formed by one or more openings, which are designed as slots, for example.

In one embodiment, the cooling air inlet 114 is formed at a transition area of the housing 28 to the cleaning head 14 and in particular to the outer sleeve 74 .

The cooling air inlet 114 is thus delimited on one side by the housing 28 and on the other side by the outer sleeve 74.

That area of the housing 28 which delimits the cooling air inlet 114 or on which the cooling air inlet is formed is in particular an area 116 which holds the tank device 42 for cleaning liquid.

The cooling air inlet 114 is arranged in particular at a transition area of the housing 28 to the cleaning head 14 .

The cooling air guiding device 112 has one or more fluid paths 118 through the motor housing 79 via corresponding one or more channels. Similarly, an inlet 120 on motor housing 79 is fluidly coupled to cooling air inlet 114 .

In one exemplary embodiment, the cooling air guiding device 112 has a first duct 122 or a plurality of first ducts 122 which are/are connected directly to the cooling air inlet 114 and run in the direction of the housing 28 . The channel(s) 122 is or are limited by the inner sleeve 72 on one side.

One or more second channels 124 are also provided, which run at least approximately parallel to the first channel or channels 122 . A deflection area 126 is arranged between the first channel or channels 122 and the second channel or channels 124 . The one or more second channels 124 lie between the inner sleeve 72 and the motor housing 79. The one or more inlets 120 into the motor housing 79 lie at the one or more second channels 124.

At least one first fluid path 128a is provided through the first channel or channels 122 . At least one second fluid path 128b is provided through the second channel or channels 124 . A main flow in the second fluid path 128b is at least approximately indirectly parallel to a main flow in the first fluid path 128a. From the outside, cooling air is coupled into the first fluid path 128a via the cooling air inlet 114 . A diversion takes place from the first fluid path 128a in the deflection area 126 into the second fluid path 128b. Cooling air is then coupled from there into the motor housing 79 via the inlet 120 .

The cooling air guiding device 112 also has at least one duct 130 which is guided on the exhaust air side from the drive motor 78 to the device body 12 and is guided through the housing 28 .

The (at least one) channel 130 is in particular oriented parallel to the longitudinal axis 20 .

In an exemplary embodiment, it is arranged on the device body 12 in the housing 28 behind the tank device 42 for cleaning liquid (cf figure 4 ). When the tank device 42 for cleaning liquid is positioned on the device body 12, this at least one channel 130 is covered towards a front side of the surface cleaning machine 10 (cf figure 7 ).

It can be provided that a collector 132 for cooling air which has flowed through the drive motor 78 is arranged on the drive motor 78 and in particular on the motor housing 79 . The channel 130 is then connected to the collector 132 .

The collector 132 is, for example, funnel-shaped towards a connection 134 for the channel 130 .

The channel 130 of the cooling air guiding device 112 is fluidically connected to a cooling air outlet 136 . The cooling air outlet 136 has one or more openings, which are designed as slots, for example. "Used" cooling air, which was heated by flowing past the motor 78, is discharged to the environment via the cooling air outlet.

In one exemplary embodiment, provision is made for the cooling air outlet 136 to be positioned in an upper area 138 of the housing 28 and in particular to be positioned at a height which lies on or above an upper side 140 of the tank device 42 for cleaning liquid.

The duct 130 provides a kind of suction snorkel through which the heated cooling air is discharged to the environment at a relatively large distance from the drive motor 78 .

The motor housing 79 extends axially (parallel to the drive axis 82) between a first end 142a and a second end 142b. In relation to this axial direction between the first end 142a and the second end 142b, the cooling air inlet 114 is at the level of the drive motor 78, i.e. it is in a transverse plane to the drive axle 82, with this transverse plane between the first end 142a and the second end 142b.

When the surface cleaning machine 10 is set up on the surface 16 to be cleaned and is held by the handle 24 by an operator, the cooling air outlet 136 is at a distance from the cooling air inlet 114, the distance between the cooling air outlet 136 and the surface 16 to be cleaned is a multiple of the distance from the cooling air inlet 114 to the surface 16 to be cleaned.

In particular, the distance between the cooling air outlet 136 and the axis of rotation 68, based on the longitudinal axis 20, is at least three times as much the distance from the cooling air inlet 114 to the axis of rotation 68 in relation to the longitudinal axis 20.

In a preferred exemplary embodiment, the cooling air routing device 112 is coupled to a process air routing device 144 of the suction unit device 32 . The process air routing device 144 has a process air inlet 146 . This process air inlet 146 is formed via the suction port 54 or the suction ports 54 .

The process air guiding device 144 also includes the suction channel(s) which lead from the suction port(s) 54 to the blower 34 .

In the exemplary embodiment shown, the process air routing device 144 includes the suction channel 44 with the areas 46, 50 and 52.

The process air guiding device also has a process air outlet 148 which is arranged in particular on the housing 28 in the area of the fan 34 .

The process air outlet 148 has one or more openings, which are formed in particular by slits. "Used" process air is released into the environment via it.

The process air guiding device 144 has (at least) one suction path 150 in which negative pressure conditions prevail during a cleaning operation. The at least one suction path 150 is formed in particular in the first area 46 .

It is provided that the cooling air guiding device 112 is coupled to the process air guiding device 144 .

As a result, the cooling air routing device 112 and the process air routing device 144 have one or more common fluid paths.

It is provided that at least one of the inlets or outlets is omitted. In the exemplary embodiment shown, a cooling air outlet is then formed by the process air outlet 148 . A separate cooling air outlet no longer needs to be provided.

The at least one channel 130 opens into the suction channel 44 and thereby into the suction path 150.

A corresponding mouth area 152 is located in particular at the height of the suction unit device 32.

In one embodiment, this outlet area 152, which is a coupling area of the cooling air guiding device 112 into the process air guiding device 144, is located downstream of the separator 38. As a result, cooling air, which is formed by a pure air flow, does not have to pass through the separator 38.

In principle, it is also possible for the corresponding coupling point (the opening region 152 ) to be upstream of the separator 38 .

In one exemplary embodiment, at least one rib 170 is positioned in the suction path 150 associated with the mouth region 152 . The rib 170 is aligned, for example, parallel to a main flow direction of the suction flow in the suction path 150 , the main flow direction being in particular essentially parallel to the longitudinal axis 20 .

The rib 170 is arranged and configured in such a way that the penetration of liquid droplets from the suction path 150 into the cooling air guiding device 112 is influenced in such a way that fewer droplets can penetrate into the cooling air guiding device 112 at the mouth area 152 .

The suction flow in the suction path 150 may contain liquid droplets. The goal is to prevent the penetration of liquid droplets from the suction flow into the cooling air guiding device 112 at the mouth area 152 as far as possible.

The rib 170 provides a type of screen that shields an orifice 174 of the orifice portion 152 to some extent.

The rib 170 can advantageously also be arranged and designed in such a way that an air flow from the cooling air guiding device 112 is guided through it and, in particular, deflected when it flows into the suction path 150 .

A blocking element 176 is arranged on the mouth area 152 . The blocking element 176 is connected to the channel 130 in the mouth area 152 and has an area 178 with which it protrudes into the suction path 150 . This area 178 forms an overhang of the cooling air guiding device 112 in the suction path 150.

The blocking member 176 is, for example, a tube (tube). It is preferably made of a rubber material. The opening 174 of the cooling air guiding device 112 lies in the area 178 of the blocking element 176. The opening 174 is thus at a distance from a wall 180 at which the channel 130 ends. It protrudes into the suction path 150.

The rib 170 is associated with the mouth 174 . It is arranged and designed in such a way that the main flow of the suction flow in the main flow direction 172 does not act directly on the orifice 174 .

A mouth opening 182 of the mouth 174 is oriented obliquely to the main flow direction 172; it is oriented at an acute angle 184 . The orientation is such that the distance from the main flow direction 172 (or the longitudinal axis 20) is in the main flow direction 172 enlarged. The orifice opening 182 points away from the main flow to a certain extent in the main flow direction 172 .

The blocking element 176 also ensures that the risk of drops of liquid penetrating into the cooling air guiding device 112 (into the duct 130) is reduced.

In an area 186 (aperture area) of the suction path 150, which is located at the outlet area 152, a discharge channel 188 for liquid opens out. The discharge channel 188 leads away from the junction area 186 downwards in relation to the direction of gravity when the surface cleaning machine 10 is set up over the cleaning roller 18 on the surface 16 to be cleaned in a normal operating mode. Liquid that would otherwise collect in the area 186 can drain through the drain channel 188 . This also reduces the risk of liquid penetrating from the suction path 150 into the cooling air guiding device 112 .

The drain channel 188 leads to a collection device for liquid. The collecting device for liquid can be a collector which is correspondingly fluidly connected to the tank device 40 for dirty liquid, or the tank device 40 itself can represent such a collecting device. It is also possible for the discharge channel 188 to lead to the separator 38 or to a fluid path of the suction unit device 32, which is connected upstream of the suction path 150, with a separator stage being connected in between accordingly.

The (at least one) rib 170, the blocking element 176 and the drain channel 188 help to greatly reduce the risk of liquid droplets from the suction flow in the suction path 150 penetrating into the cooling air guiding device 112 at the mouth region 152.

Downstream of this mouth area 152, the process air guiding device 144 and the cooling air guiding device 112 have the same fluid paths.

The fan 34 forms a drive for the flow of cooling air through the cooling air guiding device 112. Cooling air is sucked through the cooling air guiding device 112 through the opening area 152, which opens into the suction path 150, driven by the fan 34.

In the example mentioned above, in which the cooling air outlet 136 is separate from the process air guiding device 144 , the drive motor 78 in particular has a fan for cooling air in order to drive cooling air through the cooling air guiding device 112 .

In figure 8 an arrangement is shown schematically, in which the cooling air guiding device 112, which is assigned to the drive motor 78, and the process air guiding device 144, which is assigned to the suction unit device 32, are completely separate from one another.

In figure 9 the solution according to the invention described above is shown schematically. Cooling air is coupled into the surface cleaning machine 10 via the cooling air inlet 114 and is supplied to the drive motor 78 for its air cooling. Discharged cooling air is coupled into the process air routing device 144 and coupled out together with process air at the process air outlet 148 .

In principle, the direction of flow is reversible; this is in figure 9 shown by the arrows in broken lines. In principle, it is possible for a common inlet for cooling air and process air to be provided instead of a common outlet for cooling air and process air. Cooling air is then decoupled from the process air and fed to the drive motor 78 . The cooling air inlet 114 described above then forms a cooling air outlet.

In principle, it is also possible, as in figure 10 indicated that the corresponding air routing system with the cooling air routing device 112 and the process air routing device 114 only has one inlet 154 and one outlet 156 . Air is coupled in via the inlet and is initially used as process air. This air is then fed to the drive motor 78 as cooling air and released back into the environment at the outlet 156 .

In principle, the direction of flow can also be reversed, ie the roles for the inlet 154 and outlet 156 are reversed. Air is first coupled in, which is then fed to the drive motor 78 as cooling air. Air discharged accordingly by the drive motor 78 is then used as process air for the suction unit device 32 .

In figure 11 the exemplary embodiment with the cooling air outlet 136 is shown schematically. The channel 130 allows the outlet 136 to be positioned at a large distance from the cooling air inlet 114 in the manner of a snorkel.

A type of bypass cooling of the drive motor 78 can be achieved by the solution according to the invention.

In particular, cooling air from the drive motor 78 is coupled into the process air guiding device 144 . The blower 34 of the suction unit device 32 ensures that cooling air is sucked in from the cooling air duct device 112. Exhaust air from the drive motor 78 is coupled into the process air duct and released to the environment together with process air exhaust air.

The solution according to the invention allows the number of openings that are required for cooling air to be kept small in the immediate vicinity of the cleaning head 14 . This achieves a high level of splash water protection.

In the embodiment in which the cooling air guiding device 112 is coupled to the process air guiding device 144, the fan 34 can provide a suction drive with its fan motor 36, via which the drive motor 78 can be actively cooled by means of cooling air. The corresponding process air outlet 148 is also a cooling air outlet, which can be positioned at a great distance from the cleaning roller 18 on the surface cleaning machine (related to a cleaning operation). This makes it possible to achieve high splash water resistance. (The outlet area of the process air guiding device 144 is designed to be water-resistant anyway.)

The solution according to the invention allows a cooling air outlet to be positioned far away from the cleaning roller 18 and, during normal cleaning operation, far away from the surface 16 to be cleaned. In principle, the number of outlets can also be reduced if a cooling air outlet coincides with a process air outlet.

Due to the driven driving of cooling air through the cooling air guiding device 112 by means of the blower 34 , no fan has to be provided for the drive motor 78 . As a result, it can be dimensioned with a lower power consumption and, in particular, can also be realized with a lower mass.

The surface cleaning machine 10 according to the invention works as follows:
For a cleaning operation, the surface cleaning machine 10, as in figure 1 shown supported on the cleaning roller 18 on the surface 16 to be cleaned. An operator stands on the surface 16 to be cleaned behind the surface cleaning machine 10 and holds it, for example, with one hand on the handle 24.

The operator can perform a forward thrust in the forward direction 158 .

During a cleaning operation, the suction fan 34 generates a suction flow, which causes a negative pressure in the suction channel 44 and thus in the areas 46, 50 and 52 compared to the outer space 160.

In the variant in which the cooling air guiding device 112 is coupled to the process air guiding device 144, this suction flow also causes cooling air to be sucked in at the cooling air inlet 114 with a flow through the cooling air guiding device 112, which opens into the suction path 150 in the mouth region 152.

The drive motor 78 generates a torque which is transmitted to the cleaning roller 18 via the gear mechanism 84 . This is driven in rotation. In particular, it is turned counterclockwise (in figure 1 indicated by reference numeral 162) driven in rotation.

In principle, it can be provided that a peripheral speed of the cleaning roller can be set by an operator, or that this speed is fixed.

The cleaning roller 18 has the facing 56 which can be compressed. The trimming 56 is made in particular from a textile material.

The cleaning roller 18 is, for example, directly moistened with cleaning liquid from the tank device 42 by the moistening device 110 . In one embodiment, this application of liquid is pump-free and, in particular, solenoid valve-free.

By specifying an angular position 164 (cf figure 1 ) make an appropriate adjustment, for example to enable cleaning under furniture or the like.

Dirt on the surface to be cleaned is softened by cleaning liquid and can then be taken along via the cleaning roller 18 .

Suction is carried out via the process air inlet 146 (the suction opening or suction openings 54) by means of the suction flow produced. Separation into solid dirt particles and liquid takes place at the separator 38 . Dirty liquid is collected in the tank device 40 .

The joint 62 can also be used, for example, to carry out corner cleaning or edge cleaning by machine. The device body 12 can be pivoted relative to the cleaning head 14 about the pivot axis 64 in the pivoting range.

Relative to a normal operating mode, the relatively heavy drive motor 78 is arranged far below in the vicinity of the cleaning roller 18 and is positioned at least partially on the joint 62 to save space. A cooling air outlet can in turn be positioned at a large distance from the cleaning roller 18 .

Coarse dirt can be swept by a sweeping element, which can then be taken along by the cleaning roller 18 .

Reference List

10

surface cleaning machine

12

device body

14

cleaning head

16

Surface to be cleaned

18

cleaning roller

20

longitudinal axis

22

Rod

24

Handle

26

Switch

28

Housing

30

hook device

32

suction unit device

34

fan

36

blower motor

38

separator

40

Tank device for dirty liquid

42

Tank device for cleaning fluid

44

suction channel

46

First area

50

second area

52

third area

54

suction mouth

56

trimming

58

sleeve

62

joint

64

pivot axis

66

acute angle

68

axis of rotation

70

longitudinal axis

72

(inner) sleeve

74

outer sleeve

76

drive device

78

drive motor

79

motor housing

80

motor shaft

82

drive axle

84

gear mechanism

86

speed reducer

88

bevel gear

90

First face

92

Second front

94

Housing

96

Cleaning roller holder

100

Middle area

102

drive element

104

Wave

106

belt

108

gap

110

humidification device

112

cooling air guiding device

114

Cooling Air Intake

116

Area

118

fluid path

120

inlet

122

First channel

124

second channel

126

deflection area

128a

First fluid path

128b

Second fluid path

130

channel

132

collector

134

Connection

136

cooling air outlet

138

upper area

140

top

142a

First ending

142b

second ending

144

process air flow device

146

process air inlet

148

process air outlet

150

suction way

152

mouth area

154

inlet

156

outlet

158

forward direction

160

outdoor space

162

counterclockwise

164

angular position

170

rib

172

main flow direction

174

mouth

176

blocking element

178

Area

180

wall

182

muzzle opening

184

acute angle

186

Area

188

drain channel

Claims (14)

1. Surface cleaning machine, comprising a device body (12) having a housing (28), a suction unit device (32) having a fan (34), said suction unit device (32) being arranged in the housing (28), a cleaning head (14) which is arranged at the device body (12) outside of the housing (28) and comprises at least one cleaning roller (18) and is operatively connected to the suction unit device (32) for fluid communication therewith, an air-cooled drive motor (78) for rotatingly driving the at least one cleaning roller (18), a process air routing device (144) for process air of the suction unit device (32), wherein the drive motor (78) is arranged outside of the housing (28) of the device body (12), and a cooling air routing device (112) for cooling air of the drive motor (78) which comprises at least one fluid path which is arranged at or in the housing (28), wherein the cooling air routing device (112) is coupled to the process air routing device (144) and wherein the cooling air routing device (112) comprises a cooling air inlet (114) and a cooling air outlet (136) and wherein the process air routing device (144) comprises a process air inlet (146) and a process air outlet (148), characterized by a wetting device (110) for wetting the at least one cleaning roller (18) with cleaning liquid, and characterized in that the cooling air outlet (136) and the process air outlet (148) coincide, and in that the process air inlet (146) is formed by one or more suction mouths (54) at the cleaning head (14), and in that the cooling air inlet (114) is arranged at a distance from the process air inlet (146) and, when the surface cleaning machine is operated in a cleaning mode, is positioned above the process air inlet (146) with respect to the direction of gravity (g).
2. Surface cleaning machine in accordance with claim 1, characterized in that the process air routing device (144) and the cooling air routing device (112) comprise at least one common fluid path.
3. Surface cleaning machine in accordance with claim 1 or 2, characterized in that the process air outlet (148) forms the cooling air outlet (136) and/or the process air inlet forms the cooling air inlet, and in particular

   characterized by a cooling air inlet (114), a process air inlet (146) and a common outlet (148) for cooling air and process air, and in particular

   characterized in that the cooling air inlet (114) is arranged at the cleaning head (14) or at a transition region from the cleaning head (14) to the housing (28) of the device body (12), and in particular

   characterized in that the process air outlet (148) is arranged at the device body (12) and is in particular arranged at the housing (28) of the device body (12) and is in particular arranged at a distance from the cleaning head (14) and is in particular arranged at a distance from the drive motor (78).
4. Surface cleaning machine in accordance with any one of the preceding claims, characterized in that the drive motor (78) is arranged in a motor housing (79), and in particular

   characterized in that the cooling air routing device (112) comprises at least one fluid path through the motor housing (79), and in particular

   characterized in that the motor housing (79) is arranged in a sleeve (72), and in particular in that the cooling air routing device (112) comprises at least one fluid path which is located along the sleeve (72) and/or is located between the sleeve (72) and the, or a, motor housing (79), and in particular in that the cooling air routing device (112) comprises a first fluid path (128a) which extends along the sleeve (72) and is located at an exterior side of the sleeve (72), and comprises a second fluid path (128b) which extends along the sleeve (72) at an interior side of the sleeve facing towards the motor housing (79), and in particular

   characterized in that the motor housing (79) extends along an axial direction between a first end (142a) and a second end (142b) and in that a cooling air inlet (114) of the cooling air routing device (112) is positioned at the surface cleaning machine, between the first end (145a) and the second end (142b) relative to the axial direction.
5. Surface cleaning machine in accordance with any one of the preceding claims, characterized in that the cleaning head (14) is pivotable relative to the drive motor (78) and is in particular pivotable relative to a sleeve (72), in particular wherein the sleeve (72) forms a pivot bearing element, and in particular
   characterized in that the sleeve (72) is connected to the device body (12) in rotationally fixed relation therewith.
6. Surface cleaning machine in accordance with any one of the preceding claims, characterized in that the cooling air routing device (112) is coupled to a suction area (150) of the process air routing device (144), and in particular

   characterized in that at least one fluid path of the cooling air routing device (112) opens out into at least one suction path (150) of the process air routing device (144), and in particular in that the at least one suction path (150) comprises at least one rib (170) which is associated with a mouth (174) of the at least one fluid path of the cooling air routing device (112) into the at least one suction path (150), and in particular

   characterized in that a blocking element (176) for blocking the ingress of droplets from the at least one suction path (150) into the cooling air routing device (112) is arranged at a mouth of the cooling air routing device (112) into the at least one suction path (150), and in particular in that the blocking element (176) comprises an area (178) with which it projects into the at least one suction path (150) and is in particular configured as a tube and in particular comprises a mouth opening (182) which is oriented at an inclined angle to a main flow direction (172) in the at least one suction path (150), and in particular

   characterized in that the at least one suction path (150) has opening thereinto at least one drain channel (188) for liquid which in particular leads from an area of junction (186) of the cooling air routing device (112) with the at least one suction path (150) to a collection device for liquid, and in particular

   characterized in that the at least one fluid path of the cooling air routing device (112) which opens into at least one suction path (150) of the process air routing device (144) is arranged downstream of the drive motor (78) with respect to a cooling air flow, and in particular

   characterized in that the at least one suction path (150) of the process air routing device (144) into which the at least one fluid path of the cooling air routing device (112) opens is located upstream of the fan (34) and in particular upstream of a separator (38) or downstream of the separator (38), with respect to a suction air flow.
7. Surface cleaning machine in accordance with any one of the preceding claims, characterized in that the suction unit device (32) comprises a fan motor (36) for the fan (34) which is arranged in the housing (28).
8. Surface cleaning machine in accordance with any one of the preceding claims, characterized in that the drive motor (78) is positioned at the cleaning head (14) or is positioned at a transition region from the cleaning head (14) to the fan (28).
9. Surface cleaning machine in accordance with any one of the preceding claims, characterized in that a drive axis (82) of the drive motor (78) and a rotary axis (68) of the at least one cleaning roller (18) are oriented transversely and in particular perpendicularly to each other.
10. Surface cleaning machine in accordance with any one of the preceding claims, characterized in that a gear device (84) is provided for transmitting torque from the drive motor (78) to the at least one cleaning roller (18).
11. Surface cleaning machine in accordance with any one of the preceding claims, characterized in that the cleaning head (14) is located at the device body (12) via a joint (62) for pivotal movement about a pivot axis (64), and in particular
    characterized in that the pivot axis (64) is oriented transversely with respect to a longitudinal axis (20) of the device body and is in particular oriented at an acute angle (66) relative to the longitudinal axis (20) and/or in that a drive axis (82) of the drive motor (78) is at least approximately parallel to or coaxial with the pivot axis (64).
12. Surface cleaning machine in accordance with any one of the preceding claims, characterized in that a tank device (42) for cleaning liquid is arranged at the device body (12) and/or in that a receiving device for dirt and/or a tank device (40) for dirty liquid is arranged at the device body (12).
13. Surface cleaning machine in accordance with any one of the preceding claims, characterized in that, when operated in a cleaning mode, the surface cleaning machine is only supported via the at least one cleaning roller (18) on a surface (16) to be cleaned.
14. Surface cleaning machine in accordance with any one of the preceding claims, characterized in that an inlet (114; 146) for air and/or an outlet (136; 148) for air comprises one or more slits or is formed by one or more slits.

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