Abstract:
The invention relates to a wiping device, in particular a wiping device for a motor vehicle pane, comprising a spoiler unit ( 22   a - 22   p ). According to the invention, said spoiler unit ( 22   a - 22   p ) is produced in a co-extrusion process.

Description:
BACKGROUND OF THE INVENTION 
     A wiping device, in particular a wiping device for a motor vehicle pane, with a spoiler unit, is already known. 
     SUMMARY OF THE INVENTION 
     The invention is based on a wiping device, in particular a wiping device for a motor vehicle pane, with a spoiler unit. 
     It is proposed that the spoiler unit is produced in a co-extrusion process whereby the spoiler unit can be produced in a particularly stable manner and at the same time economically. The term “spoiler unit” in this context in particular means a unit which is provided to deflect travel wind acting on the wiping device and/or to use this to press a wiper blade onto a vehicle pane. A “co-extrusion process” in this context in particular means the merging of at least two plastic melts of different types before they leave a profile nozzle. A “wiper blade” in this context in particular is a strip which is provided to wipe a vehicle pane. Preferably the wiper blade is made of a rubber material. The term “provided” in particular should be understood as specially designed and/or equipped. Preferably the spoiler unit has at least one concave outer face. 
     Furthermore it is proposed that the spoiler unit has two spoiler part elements of different hardness, whereby advantageously weight can be reduced and strength increased. 
     Furthermore it is proposed that the harder spoiler part element terminates the spoiler unit laterally, whereby the softer spoiler part element can advantageously be protected from damage. The term “laterally” in this context is understood in particular as when viewed in the wiping direction. “Terminate” in this context in particular means cover, surround and/or conceal. 
     In a further embodiment of the invention, it is proposed that the softer spoiler part element has a longitudinal channel with a triangular cross section, whereby advantageously material and weight can be saved. “Triangular” in this context means a contour with three corners. The corners can also be rounded, depending on application. 
     If the softer spoiler part element and the harder spoiler part element are joined together by material fit over a wide area in a plane running parallel to a wiping direction, a particularly stable connection of the spoiler part elements can be achieved. The term “wiping direction” in this context in particular means the direction which extends parallel to a surface to be wiped and/or vertically to the main orientation of the wiper blade. The phrase “over a wide area” in this context in particular means over a majority of a joining area. A “majority” in this context is in particular more than 50%, preferably more than 80%. 
     Furthermore it is proposed that the wiping device comprises a holding unit which has a holding element with a longitudinal guidance channel to guide a spring element, wherein the holding element has at least one fixing element which is provided to couple the spoiler unit by form fit in mounted state, whereby a particularly secure mounting of the spoiler unit can be achieved. A “holding unit” in this context means in particular a unit which is provided to connect the spoiler unit with a wiper blade. A “holding element” in this context in particular means an element which is provided to connect a spoiler unit, a spring element and a wiper blade by form fit. A “fixing element” in this context is in particular an element which is provided to create a form fit with a corresponding component. A “longitudinal guidance channel” in this context in particular is a guidance channel which extends parallel to a longitudinal direction of the holding unit. Preferably the longitudinal guidance channel comprises a cavity and at least one channel wall adjacent to the cavity. A “longitudinal direction” in this context is in particular a direction which extends substantially parallel to a longitudinal extension of the holding element. A “longitudinal extension” in this context in particular means as large as possible an extension. “Substantially” in this context in particular means a deviation of less than 10°, preferably less than 5°. An “extension” of an element in this context in particular is a maximum distance between two points of a vertical projection of the element on a plane. A “spring element” in this context in particular is a spring-elastic element which has at least one extension which in normal operating state can be varied elastically by at least 10%, in particular by at least 20%, preferably by at least 30% and particularly advantageously by at least 50%, and which in particular generates a counter-force depending on the change in extension and preferably proportional to the change, which counters the change. “Coupling” in this context means connecting and/or joining. 
     In a main contact flow region of the wiping device, joints and hence flow resistances and/or noise can be avoided if the spoiler unit lies at least partly laterally on the holding element in the region of the longitudinal guidance channel. “Laterally” in this context in particular means viewed from the wiping direction. 
     Furthermore it is proposed that the holding element has at least one fixing means which with a free end faces the longitudinal guidance channel and is provided to create a form fit with the spoiler unit, whereby the wiping device can be formed in a particularly stable manner. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Further advantages arise from the description of the drawings below. The drawings show 16 exemplary embodiments of the invention. The drawings, description and claims contain numerous features in combination. The person skilled in the art shall where applicable also consider the features individually and combine these into further sensible combinations. 
       The drawings show: 
         FIG. 1  a cross section view of a wiping device with a holding unit; 
         FIG. 2  a cross section view of a further exemplary embodiment of a wiping device with a holding unit; 
         FIG. 3  a cross section view of a further exemplary embodiment of a wiping device with a holding unit; 
         FIG. 4  a cross section view of a further exemplary embodiment of a wiping device with a holding unit; 
         FIG. 5  a cross section view of a further exemplary embodiment of a wiping device with a holding unit; 
         FIG. 6  a cross section view of a further exemplary embodiment of a wiping device with a holding unit; 
         FIG. 7  a cross section view of a further exemplary embodiment of a wiping device with a holding unit; 
         FIG. 8  a cross section view of a further exemplary embodiment of a wiping device with a holding unit; 
         FIG. 9  a cross section view of a further exemplary embodiment of a wiping device with a holding unit; 
         FIG. 10  a cross section view of a further exemplary embodiment of a wiping device with a holding unit; 
         FIG. 11  a cross section view of a further exemplary embodiment of a wiping device with a holding unit; 
         FIG. 12  a cross section view of a further exemplary embodiment of a wiping device with a holding unit; 
         FIG. 13  a cross section view of a further exemplary embodiment of a wiping device with a holding unit; 
         FIG. 14  a cross section view of a further exemplary embodiment of a wiping device with a holding unit; 
         FIG. 15  a cross section view of a further exemplary embodiment of a wiping device with a holding unit; 
         FIG. 16  a cross section view of a further exemplary embodiment of a wiping device with a holding unit. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  shows a cross section view of a wiping device according to the invention with a holding unit  10   a  with a holding element  12   a  having a longitudinal guidance channel  14   a  to guide a spring element  16   a . The section plane runs perpendicular to a longitudinal direction of the holding element  12   a.    
     The holding element  12   a  has two fixing elements  18   a ,  20   a . The fixing elements  18   a ,  20   a  are formed integrally with the holding element  12   a . At their free ends  24   a ,  26   a , the fixing elements  18   a ,  20   a  point in directions away from each other, parallel to a wiping direction  88   a . Furthermore the fixing elements  18   a ,  20   a  extend in an L-shape from channel walls  36   a ,  38   a  which delimit the longitudinal guidance channel  14   a . A distance between the free ends  24   a ,  26   a  is greater than a width of the longitudinal guidance channel  14   a . The fixing elements  18   a ,  20   a  are provided to couple a spoiler unit  22   a  by form fit in a mounted state. For this the free ends  24   a ,  26   a  of the fixing elements  18   a ,  20   a  are surrounded by the spoiler unit  22   a . The spoiler unit  22   a  has two L-shaped fixing means  44   a ,  46   a  and support bodies  48   a ,  50   a  adjacent to the fixing means  44   a ,  46   a.    
     To guide the spring element  16   a , side walls  52   a ,  54   a  of the longitudinal guidance channel  14   a  border the channel walls  36   a ,  38   a . The channel walls  36   a ,  38   a  here enclose a right angle with the side walls  52   a ,  54   a . Furthermore an intermediate wall  56   a  is arranged on the side walls  52   a ,  54   a  which terminates the longitudinal guidance channel  14   a  in the direction of a wiper blade  40   a . The side walls  52   a ,  54   a  extend from the intermediate wall  56   a  in a direction away from the wiper blade  40   a . The holding element  12   a  has a longitudinal opening  84   a  which opens the longitudinal guidance channel  14   a  towards the spoiler unit  22   a.    
     Two L-shaped guide profiles  58   a ,  60   a  of the holding unit  10   a  are arranged on the intermediate wall  56   a . The guide profiles  58   a ,  60   a  are formed integrally with the holding element  12   a . The guide profiles  58   a ,  60   a  each have a side guide  62   a ,  64   a  and a vertical guide  66   a ,  68   a . The vertical guides  66   a ,  68   a  enclose an angle of 90° with the respective side guides  62   a ,  64   a . The vertical guides  66   a ,  68   a  point towards each other. The side guides  62   a ,  64   a  each enclose an angle of 90° to the intermediate wall  56   a . The guide profiles  58   a ,  60   a  point in directions towards each other at their free ends of the vertical guides  66   a ,  68   a . The guide profiles  58   a ,  60   a  and the intermediate wall  56   a  form a piping rail  70   a  in which the wiper blade  40   a  is introduced. 
     The holding element  12   a  is produced integrally from polyethylene in an extrusion process. A person skilled in the art in this context will consider various plastics which appear suitable such as in particular polypropylene, polyamide, polyvinyl chloride and/or polystyrene. 
     The spoiler unit  22   a  is produced in a co-extrusion process from two spoiler part elements  32   a ,  34   a  of different hardness. The first spoiler part element  32   a  has two spoiler sides  76   a ,  78   a  which are formed concave towards the outside. To reinforce the spoiler unit  22   a , the first spoiler part element  32   a  has a connecting web  80   a  which joins together the concave spoiler sides  76   a ,  78   a . The connecting web  80   a  and the spoiler sides  76   a ,  78   a  surround a longitudinal channel  82   a  with a triangular cross section. 
     The first spoiler part element  32   a  is formed integrally with the second spoiler part element  34   a  and is provided to deflect travel wind. The second spoiler part element  34   a  has a greater strength and hardness than the first spoiler part element  32   a . The L-shaped fixing means  44   a ,  46   a  and the support bodies  48   a ,  50   a  adjacent to the fixing means  44   a ,  46   a  are molded onto the second spoiler part element  34   a . The harder spoiler part element  34   a  surrounds the fixing elements  18   a ,  20   a  and thus terminates the holding unit  10   a  laterally. 
     Furthermore the second spoiler part element  34   a  has two support webs  72   a ,  74   a . The support webs  72   a ,  74   a  lie with their free ends on the fixing elements  18   a ,  20   a  on a side facing away from the wiper blade  40   a . The support webs  72   a ,  74   a  are provided for transmitting contact forces which occur at the spoiler unit  22   a  when exposed to travel wind. The support webs  72   a ,  74   a  extend over the entire length of the spoiler unit  22   a.    
     The spring element  16   a  is let into the longitudinal guidance channel  14   a . The spring element  16   a  is made from spring steel and is provided to form the holding unit  10   a  in an elastically deflectable manner. 
     For assembly, first the spring element  16   a  is introduced into the longitudinal guidance channel  14   a . Then the wiper blade  40   a  is pushed into the piping rail  70   a  and creates a form fit with the holding element  12   a . The spoiler unit  22   a  is now pushed over the fixing elements  18   a ,  20   a  and is then connected therewith by form fit. 
       FIGS. 2 to 16  describe 15 further exemplary embodiments of the invention. The descriptions below are substantially restricted to the differences between the exemplary embodiments, wherein with regard to components, features and functions which remain the same, reference can be made to the description of the first exemplary embodiment. To distinguish the exemplary embodiments, the letter a in the reference numerals of the exemplary embodiment in  FIG. 1  is replaced by the letters b to p in the reference numerals of the exemplary embodiments in  FIGS. 2 to 16 . With regard to components of the same designation, in particular components with the same reference numerals, in principle reference can also be made to the drawings and/or the description of the first exemplary embodiment. 
       FIG. 2  shows a cross section view of a further exemplary embodiment of a wiping device according to the invention with a holding unit  10   b  with a holding element  12   b  having a longitudinal guidance channel  14   b  to guide a spring element  16   b . The section plane runs perpendicular to a longitudinal direction of the holding element  12   b.    
     The holding element  12   b  has two fixing elements  18   b ,  20   b . The fixing elements  18   b ,  20   b  are formed integrally with the holding element  12   b . At their free ends  24   b ,  26   b , the fixing elements  18   b ,  20   b  point in directions away from each other. Furthermore the fixing elements  18   b ,  20   b  form two channel walls  36   b ,  38   b  which border the longitudinal guidance channel  14   b  on a side facing away from the wiper blade. In the region of their free ends  24   b ,  26   b , the fixing elements  18   b ,  20   b  are formed as barbs. The ends  24   b ,  26   b  are surrounded by a spoiler unit  22   b . For this, the spoiler unit  22   b  has two fixing means  44   b ,  46   b.    
     To guide the spring element  16   b , side walls  52   b ,  54   b  of the longitudinal guidance channel  14   b  border the channel walls  36   b ,  38   b . The channel walls  36   b ,  38   b  here enclose a right angle with the side walls  52   b ,  54   b . Furthermore an intermediate wall  56   b  is arranged on the side walls  52   b ,  54   b  which terminates the longitudinal guidance channel  14   b  in the direction of a wiper blade  40   b . The side walls  52   b ,  54   b  extend from the intermediate wall  56   b  in a direction away from the wiper blade  40   b . The holding element  12   b  has a longitudinal opening  84   b  which opens the longitudinal guidance channel  14   b  towards the spoiler unit  22   b.    
     Two L-shaped guide profiles  58   b ,  60   b  of the holding unit  10   b  are arranged on the intermediate wall  56   b . The guide profiles  58   b ,  60   b  are formed integrally with the holding element  12   b . The guide profiles  58   b ,  60   b  each have a side guide  62   b ,  64   b  and a vertical guide  66   b ,  68   b . The vertical guides  66   b ,  68   b  enclose an angle of 90° with the respective side guides  62   b ,  64   b . The vertical guides  66   b ,  68   b  point towards each other. The side guides  62   b ,  64   b  each enclose an angle of 90° to the intermediate wall  56   b . The guide profiles  58   b ,  60   b  point in directions towards each other at their free ends of the vertical guides  66   b ,  68   b . The guide profiles  58   b ,  60   b  and the intermediate wall  56   b  form a piping rail  70   b  in which the wiper blade  40   b  is introduced. 
     The holding element  12   b  is produced integrally from polyethylene in an extrusion process. A person skilled in the art in this context will consider various plastics which appear suitable such as in particular polypropylene, polyamide, polyvinyl chloride and/or polystyrene. 
     The spoiler unit  22   b  is produced in a co-extrusion process from two spoiler part elements  32   b ,  34   b  of different hardness. The first spoiler part element  32   b  has two spoiler sides  76   b ,  78   b  which are formed concave towards the outside. 
     The softer spoiler part element  32   b  and the harder spoiler part element  34   b  are joined together by material fit over a wide area in a plane  86   b  running parallel to a wiping direction  88   b . The plane  86   b  extends parallel to a surface  28   b  to be wiped by the wiper blade  40   b . To reinforce the spoiler unit  22   b , the second spoiler part element  34   b  has a connecting web  80   b  which joins together the concave spoiler sides  76   b ,  78   b . The connecting web  80   b  and the spoiler sides  76   b ,  78   b  are joined together by material fit and surround a longitudinal channel  82   b  which has a rectangular cross section. 
     The first spoiler part element  32   b  is formed integrally with the second spoiler part element  34   b  and is provided to deflect travel wind. The second spoiler part element  34   b  has a greater strength and hardness than the first spoiler part element  32   b . The fixing means  44   b ,  46   b  are molded onto the second spoiler part element  34   b . The fixing means  44   b ,  46   b  are formed with an acute angle and lie by form fit on the fixing elements  18   b ,  20   b . The harder spoiler part element  34   b  surrounds the fixing elements  18   b ,  20   b  and thus terminates the holding unit  10   b  laterally. The spring element  16   b  is let into the longitudinal guidance channel  14   b . The spring element  16   b  is made from spring steel and is provided to form the holding unit  10   b  in an elastically deflectable manner. 
     For assembly, first the spring element  16   b  is introduced into the longitudinal guidance channel  14   b . Then the wiper blade  40   b  is pushed into the piping rail  70   b  and creates a form fit with the holding element  12   b . The spoiler unit  22   b  is now pushed over the fixing elements  18   b ,  20   b  and is then connected therewith by form fit. 
       FIG. 3  shows a cross section view of a further exemplary embodiment of a wiping device according to the invention with a holding unit  10   c  with a holding element  12   c  having a longitudinal guidance channel  14   c  to guide a spring element  16   c . The section plane runs perpendicular to a longitudinal direction of the holding element  12   c.    
     The holding element  12   c  has two fixing elements  18   c ,  20   c . The fixing elements  18   c ,  20   c  are formed integrally with the holding element  12   c . At their free ends  24   c ,  26   c , the fixing elements  18   c ,  20   c  point in directions away from each other. Furthermore the fixing elements  18   c ,  20   c  form two channel walls  36   c ,  38   c  which border the longitudinal guidance channel  14   c  on a side facing away from the wiper blade. In the region of their free ends  24   c ,  26   c , the fixing elements  18   c ,  20   c  are formed as barbs. The ends  24   c ,  26   c  are surrounded by a spoiler unit  22   c . For this, the spoiler unit  22   c  has two fixing means  44   c ,  46   c.    
     To guide the spring element  16   c , side walls  52   c ,  54   c  of the longitudinal guidance channel  14   c  border the channel walls  36   c ,  38   c . The channel walls  36   c ,  38   c  here enclose a right angle with the side walls  52   c ,  54   c . Furthermore an intermediate wall  56   c  is arranged on the side walls  52   c ,  54   c  which terminates the longitudinal guidance channel  14   c  in the direction of a wiper blade  40   c . The side walls  52   c ,  54   c  extend from the intermediate wall  56   c  in a direction away from the wiper blade  40   c . The holding element  12   c  has a longitudinal opening  84   c  which opens the longitudinal guidance channel  14   c  towards the spoiler unit  22   c.    
     Two L-shaped guide profiles  58   c ,  60   c  of the holding unit  10   c  are arranged on the intermediate wall  56   c . The guide profiles  58   c ,  60   c  are formed integrally with the holding element  12   c . The guide profiles  58   c ,  60   c  each have a side guide  62   c ,  64   c  and a vertical guide  66   c ,  68   c . The vertical guides  66   c ,  68   c  enclose an angle of 90° with the respective side guides  62   c ,  64   c . The vertical guides  66   c ,  68   c  point towards each other. The side guides  62   c ,  64   c  each enclose an angle of 90° to the intermediate wall  56   c . The guide profiles  58   c ,  60   c  point in directions towards each other at their free ends of the vertical guides  66   c ,  68   c . The guide profiles  58   c ,  60   c  and the intermediate wall  56   c  form a piping rail  70   c  in which the wiper blade  40   c  is introduced. 
     The holding element  12   c  is produced integrally from polyethylene in an extrusion process. A person skilled in the art in this context will consider various plastics which appear suitable such as in particular polypropylene, polyamide, polyvinyl chloride and/or polystyrene. 
     The spoiler unit  22   c  is produced in a co-extrusion process from two spoiler part elements  32   c ,  34   c ,  42   c  of different hardness. The first spoiler part element  32   c  has two spoiler sides  76   c ,  78   c  which are formed concave towards the outside. The softer spoiler part element  32   c  and the harder spoiler part elements  34   c ,  42   c  are joined together by material fit over a wide area in a plane  86   c  running parallel to a wiping direction  88   c . The plane  86   c  extends parallel to a surface  28   c  to be wiped by the wiper blade  40   c . To reinforce the spoiler unit  22   c , the first spoiler part element  32   c  has a connecting web  80   c  which joins together the concave spoiler sides  76   c ,  78   c . The connecting web  80   c  and the spoiler sides  76   c ,  78   c  are joined together by material fit and surround a longitudinal channel  82   c  with a triangular cross section. 
     The first spoiler part element  32   c  is formed integrally with the spoiler part elements  34   c ,  42   c  and is provided to deflect travel wind. The spoiler part elements  34   c ,  42   c  have a greater strength and hardness than the first spoiler part element  32   c . The spoiler part elements  34   c ,  42   c  are formed separately from each other. The spoiler part element  34   c  forms the fixing means  44   c . The spoiler part element  42   c  forms the fixing means  46   c . The fixing means  44   c ,  46   c  are formed with an acute angle and lie by form fit on the fixing elements  18   c ,  20   c . The harder spoiler part element  34   c  surrounds the fixing elements  18   c ,  20   c  and thus terminates the holding unit  10   c  laterally. The spring element  16   c  is let into the longitudinal guidance channel  14   c . The spring element  16   c  is made from spring steel and is provided to form the holding unit  10   c  in an elastically deflectable manner. 
     For assembly, first the spring element  16   c  is introduced into the longitudinal guidance channel  14   c . Then the wiper blade  40   c  is pushed into the piping rail  70   c  and creates a form fit with the holding element  12   c . The spoiler unit  22   c  is now pushed over the fixing elements  18   c ,  20   c  and is then connected therewith by form fit. 
       FIG. 4  shows a cross section view of a further exemplary embodiment of a wiping device according to the invention with a holding unit  10   d  with a holding element  12   d  having a longitudinal guidance channel  14   d  to guide a spring element  16   d , and a spoiler unit  22   d . The section plane runs perpendicular to a longitudinal direction of the holding element  12   d.    
     The holding unit  10   d  has channel walls  36   d ,  38   d  which are formed integrally with the holding element  12   d . The channel walls  36   d ,  38   d  border the longitudinal guidance channel  14   d  on a side facing away from the wiper blade. Two longitudinal extensions  90   d ,  92   d  are arranged on each channel wall  36   d ,  38   d  on a side facing away from the wiper blade. The spoiler unit  22   d  has two L-shaped fixing means  44   d ,  46   d  and support bodies  48   d ,  50   d  adjacent to the fixing means  44   d ,  46   d.    
     To guide the spring element  16   d , side walls  52   d ,  54   d  of the longitudinal guidance channel  14   d  border the channel walls  36   d ,  38   d . The channel walls  36   d ,  38   d  here enclose a right angle with the side walls  52   d ,  54   d . Furthermore an intermediate wall  56   d  is arranged on the side walls  52   d ,  54   d  which terminates the longitudinal guidance channel  14   d  in the direction of a wiper blade  40   d . The side walls  52   d ,  54   d  extend from the intermediate wall  56   d  in a direction away from the wiper blade  40   d . The holding element  12   d  has a longitudinal opening  84   d  which opens the longitudinal guidance channel  14   d  towards the spoiler unit  22   d.    
     Two L-shaped guide profiles  58   d ,  60   d  of the holding unit  10   d  are arranged on the intermediate wall  56   d . The guide profiles  58   d ,  60   d  are formed integrally with the holding element  12   d . The guide profiles  58   d ,  60   d  each have a side guide  62   d ,  64   d  and a vertical guide  66   d ,  68   d . The vertical guides  66   d ,  68   d  enclose an angle of 90° with the respective side guides  62   d ,  64   d . The vertical guides  66   d ,  68   d  point towards each other. The side guides  62   d ,  64   d  each enclose an angle of 90° to the intermediate wall  56   d . The guide profiles  58   d ,  60   d  point in directions towards each other at their free ends of the vertical guides  66   d ,  68   d . The guide profiles  58   d ,  60   d  and the intermediate wall  56   d  form a piping rail  70   d  in which the wiper blade  40   d  is introduced. 
     The holding element  12   d  is produced integrally from polyethylene in an extrusion process. A person skilled in the art in this context will consider various plastics which appear suitable such as in particular polypropylene, polyamide, polyvinyl chloride and/or polystyrene. 
     The spoiler unit  22   d  is produced in a co-extrusion process from two spoiler part elements  32   d ,  34   d ,  42   d  of different hardness. The first spoiler part element  32   d  has two spoiler sides  76   d ,  78   d  which are formed concave towards the outside. To reinforce the spoiler unit  22   d , the first spoiler part element  32   d  has a connecting web  80   d  which joins together the concave spoiler sides  76   d ,  78   d . The connecting web  80   d  and the spoiler sides  76   d ,  78   d  surround a longitudinal channel  82   d  with a triangular cross section. 
     The first spoiler part element  32   d  is formed integrally with the second spoiler part element  34   d ,  42   d  and is provided to deflect travel wind. The second spoiler part element  34   d ,  42   d  has a greater strength and hardness than the first spoiler part element  32   d . The L-shaped fixing means  44   d ,  46   d  and the support bodies  48   d ,  50   d  adjacent to the fixing means  44   d ,  46   d  are molded onto the second spoiler part element  34   d ,  42   d . The harder spoiler part element  34   d ,  42   d  surrounds the holding element  12   d  in the region of the longitudinal guidance channel  14   d.    
     Furthermore the second spoiler part element  34   a ,  42   d  has two support webs  72   d ,  74   d . The support webs  72   d ,  74   d  lie with their free ends on the channel walls  36   d ,  38   d  on a side facing away from the wiper blade  40   d . The support webs  72   d ,  74   d  are provided for transmitting contact forces which occur at the spoiler unit  22   d  when exposed to travel wind. The support webs  72   d ,  74   d  extend over the entire length of the spoiler unit  22   d . The longitudinal extensions  90   d ,  92   d  partially surround the support webs  72   d ,  74   d  in a wiping direction  88   d.    
     The spring element  16   d  is let into the longitudinal guidance channel  14   d . The spring element  16   d  is made from spring steel and is provided to form the holding unit  10   d  in an elastically deflectable manner. 
     For assembly, first the spring element  16   d  is introduced into the longitudinal guidance channel  14   d . Then the wiper blade  40   d  is pushed into the piping rail  70   d  and creates a form fit with the holding element  12   d . The spoiler unit  22   d  is now pushed over the holding element  12   d  and is then connected therewith by form fit. 
       FIG. 5  shows a cross section view of a further exemplary embodiment of a wiping device according to the invention with a holding unit  10   e  with a holding element  12   e  having a longitudinal guidance channel  14   e  to guide a spring element  16   e . The section plane runs perpendicular to a longitudinal direction of the holding element  12   e . The wiping device shown substantially corresponds to the exemplary embodiment shown in  FIG. 4 . 
     In the region of the longitudinal guidance channel  14   e , a side strip  94   e ,  96   e  is molded on the holding element  12   e  on each side pointing in a wiping direction  88   e . The side strips  94   e ,  96   e  in the mounted state create a form fit with a spoiler unit  22   e . The form fit prevents a movement of the spoiler unit  22   e  relative to the holding element  12   e  in a vertical direction  102   e . The vertical direction  102   e  extends perpendicular to the longitudinal direction and perpendicular to the wiping direction  88   e.    
       FIG. 6  shows a cross section view of a further exemplary embodiment of a wiping device according to the invention with a holding unit  10   f  with a holding element  12   f  having a longitudinal guidance channel  14   f  to guide a spring element  16   f . The section plane runs perpendicular to a longitudinal direction of the holding element  12   f . The wiping device shown substantially corresponds to the exemplary embodiment shown in  FIG. 4 . 
     The holding unit  10   f  has channel walls  36   f ,  38   f  which are formed integrally with the holding element  12   f . The channel walls  36   f ,  38   f  border the longitudinal guidance channel  14   f  on a side facing away from the wiper blade. A longitudinal extension  90   f ,  92   f  is arranged on the channel walls  36   f ,  38   f  on a side facing away from the wiper blade. 
     In the region of the longitudinal guidance channel  14   f , a side strip  94   f ,  96   f  is molded on the holding element  12   f  on each side pointing in a wiping direction  88   f . The side strips  94   f ,  96   f  in the mounted state create a form fit with a spoiler unit  22   f . The form fit prevents a movement of the spoiler unit  22   f  relative to the holding element  12   f  in a vertical direction  102   f . The vertical direction  102   f  extends perpendicular to the longitudinal direction and perpendicular to the wiping direction  88   f.    
     The spoiler unit  22   f  is produced in a co-extrusion process from two spoiler part elements  32   f ,  34   f ,  42   f  of different hardness. The first spoiler part element  32   f  has two spoiler sides  76   f ,  78   f  which are formed concave towards the outside. To reinforce the spoiler unit  22   f , the first spoiler part element  32   f  has a connecting web  80   f  which joins together the concave spoiler sides  76   f ,  78   f . The connecting web  80   f  and the spoiler sides  76   f ,  78   f  surround a longitudinal channel  82   f  with a triangular cross section. 
     The first spoiler part element  32   f  is formed integrally with the second spoiler part element  34   f ,  42   f  and is provided to deflect travel wind. The second spoiler part element  34   f ,  42   f  has a greater strength and hardness than the first spoiler part element  32   f . The L-shaped fixing means  44   f ,  46   f  and the support bodies  48   f ,  50   f  adjacent to the fixing means  44   f ,  46   f  are molded onto the second spoiler part element  34   f ,  42   f . The harder spoiler part element  34   f ,  42   f  surrounds the holding element  12   f  in the region of the longitudinal guidance channel  14   f.    
     Furthermore the second spoiler part element  34   f ,  42   f  has two support webs  72   f ,  74   f . The support webs  72   f ,  74   f  lie with their free ends on the spring element  16   f  on a side facing away from the wiper blade  40   f . The support webs  72   f ,  74   f  are provided for transmitting to the spring element  16   f  contact forces which occur at the spoiler unit  22   f  when exposed to travel wind. The support webs  72   f ,  74   f  extend over the entire length of the spoiler unit  22   f . The longitudinal extensions  90   f ,  92   f  lie partially on the support webs  72   f ,  74   f  in a wiping direction  88   f.    
       FIG. 7  shows a cross section view of a further exemplary embodiment of a wiping device according to the invention with a holding unit  10   g  with a holding element  12   g  having a longitudinal guidance channel  14   g  to guide a spring element  16   g , and a spoiler unit  22   g . The section plane runs perpendicular to a longitudinal direction of the holding element  12   g.    
     The longitudinal guidance channel  14   g  is formed as a trough. The longitudinal guidance channel  14   g  is open over the entire width and length in the direction of the spoiler unit  22   g.    
     To guide the spring element  16   g , the longitudinal guidance channel  14   g  has side walls  52   g ,  54   g . Furthermore an intermediate wall  56   g  is arranged on the side walls  52   g ,  54   g  which terminates the longitudinal guidance channel  14   g  in the direction of a wiper blade  40   g . The side walls  52   g ,  54   g  extend from the intermediate wall  56   g  in a direction away from the wiper blade  40   g . The holding element  12   g  has a longitudinal opening  84   g  which opens the longitudinal guidance channel  14   g  completely towards the spoiler unit  22   g.    
     Two L-shaped guide profiles  58   g ,  60   g  of the holding unit  10   g  are arranged on the intermediate wall  56   g . The guide profiles  58   g ,  60   g  are formed integrally with the holding element  12   g . The guide profiles  58   g ,  60   g  each have a side guide  62   g ,  64   g  and a vertical guide  66   g ,  68   g . The vertical guides  66   g ,  68   g  enclose an angle of 90° with the respective side guides  62   g ,  64   g . The vertical guides  66   g ,  68   g  point towards each other. The side guides  62   g ,  64   g  each enclose an angle of 90° to the intermediate wall  56   g . The guide profiles  58   g ,  60   g  point in directions towards each other at their free ends of the vertical guides  66   g ,  68   g . The guide profiles  58   g ,  60   g  and the intermediate wall  56   g  form a piping rail  70   g  in which the wiper blade  40   g  is introduced. 
     The holding element  12   g  is produced integrally from polyethylene in an extrusion process. A person skilled in the art in this context will consider various plastics which appear suitable such as in particular polypropylene, polyamide, polyvinyl chloride and/or polystyrene. 
     The spoiler unit  22   g  is produced in a co-extrusion process from two spoiler part elements  32   g ,  34   g ,  42   g  of different hardness. The first spoiler part element  32   g  has two spoiler sides  76   g ,  78   g  which are formed concave towards the outside. To reinforce the spoiler unit  22   g , the first spoiler part element  32   g  has a connecting web  80   g  which joins together the concave spoiler sides  76   g ,  78   g . The connecting web  80   g  and the spoiler sides  76   g ,  78   g  surround a longitudinal channel  82   g  with a triangular cross section. 
     The first spoiler part element  32   g  is formed integrally with the second spoiler part element  34   g ,  42   g  and is provided to deflect travel wind. The second spoiler part element  34   g ,  42   g  has a greater strength and hardness than the first spoiler part element  32   g . The L-shaped fixing means  44   g ,  46   g  and the support bodies  48   g ,  50   g  adjacent to the fixing means  44   g ,  46   g  are molded onto the second spoiler part element  34   g ,  42   g . The harder spoiler part element  34   g ,  42   g  surrounds the holding element  12   g  in the region of the longitudinal guidance channel  14   g.    
     Furthermore the second spoiler part element  34   g ,  42   g  has two support webs  72   g ,  74   g . The support webs  72   g ,  74   g  lie with their free ends on spring element  16   g  on a side facing away from the wiper blade  40   g . The support webs  72   g ,  74   g  are provided for transmitting contact forces which occur at the spoiler unit  22   g  when exposed to travel wind. The support webs  72   g ,  74   g  extend over the entire length of the spoiler unit  22   g . The support webs  72   g ,  74   g  prevent a movement of the spring element  16   g  in a vertical direction  102   g . The vertical direction  102   g  extends perpendicular to the longitudinal direction and perpendicular to the wiping direction  88   g.    
     The spring element  16   g  is let into the longitudinal guidance channel  14   g . The spring element  16   g  is made from spring steel and is provided to form the holding unit  10   g  in an elastically deflectable manner. 
     For assembly, first the spring element  16   g  is introduced into the longitudinal guidance channel  14   g . Then the wiper blade  40   g  is pushed into the piping rail  70   g  and creates a form fit with the holding element  12   g . The spoiler unit  22   g  is now pushed over the holding element  12   g  and is then connected therewith by form fit. 
       FIG. 8  shows a cross section view of a further exemplary embodiment of a wiping device according to the invention with a holding unit  10   h  with a holding element  12   h  having a longitudinal guidance channel  14   h  to guide a spring element  16   h , and a spoiler unit  22   h . The section plane runs perpendicular to a longitudinal direction of the holding element  12   h.    
     The longitudinal guidance channel  14   h  is formed as a trough. The longitudinal guidance channel  14   h  is open over the entire width and length in the direction of the spoiler unit  22   h.    
     To guide the spring element  16   h , the longitudinal guidance channel  14   h  has side walls  52   h ,  54   h . Furthermore an intermediate wall  56   h  is arranged on the side walls  52   h ,  54   h  which terminates the longitudinal guidance channel  14   h  in the direction of a wiper blade  40   h . The side walls  52   h ,  54   h  extend from the intermediate wall  56   h  in a direction away from the wiper blade  40   h . The holding element  12   h  has a longitudinal opening  84   h  which opens the longitudinal guidance channel  14   h  completely towards the spoiler unit  22   h.    
     Two L-shaped guide profiles  58   h ,  60   h  of the holding unit  10   h  are arranged on the intermediate wall  56   h . The guide profiles  58   h ,  60   h  are formed integrally with the holding element  12   h . The guide profiles  58   h ,  60   h  each have a side guide  62   h ,  64   h  and a vertical guide  66   h ,  68   h . The vertical guides  66   h ,  68   h  enclose an angle of 90° with the respective side guides  62   h ,  64   h . The vertical guides  66   h ,  68   h  point towards each other. The side guides  62   h ,  64   h  each enclose an angle of 90° to the intermediate wall  56   h . The guide profiles  58   h ,  60   h  point in directions towards each other at their free ends of the vertical guides  66   h ,  68   h . The guide profiles  58   h ,  60   h  and the intermediate wall  56   h  form a piping rail  70   h  in which the wiper blade  40   h  is introduced. 
     The holding element  12   h  is produced integrally from polyethylene in an extrusion process. A person skilled in the art in this context will consider various plastics which appear suitable such as in particular polypropylene, polyamide, polyvinyl chloride and/or polystyrene. 
     The spoiler unit  22   h  is produced in a co-extrusion process from two spoiler part elements  32   h ,  34   h ,  42   h  of different hardness. The first spoiler part element  32   h  has two spoiler sides  76   h ,  78   h  which are formed concave towards the outside. To reinforce the spoiler unit  22   h , the first spoiler part element  32   h  has a connecting web  80   h  which joins together the concave spoiler sides  76   h ,  78   h . The connecting web  80   h  and the spoiler sides  76   h ,  78   h  surround a longitudinal channel  82   h  with a triangular cross section. 
     The first spoiler part element  32   h  is formed integrally with the second spoiler part element  34   h ,  42   h  and is provided to deflect travel wind. The second spoiler part element  34   h ,  42   h  has a greater strength and hardness than the first spoiler part element  32   h . The L-shaped fixing means  44   h ,  46   h  are molded onto the second spoiler part element  34   h ,  42   h . The harder spoiler part element  34   h ,  42   h  surrounds the holding element  12   h  in the region of the longitudinal guidance channel  14   h.    
     Furthermore the second spoiler part element  34   h ,  42   h  has two support webs  72   h ,  74   h . The support webs  72   h ,  74   h  lie with their free ends on spring element  16   h  on a side facing away from the wiper blade  40   h . The support webs  72   h ,  74   h  are provided for transmitting contact forces which occur at the spoiler unit  22   h  when exposed to travel wind. The support webs  72   h ,  74   h  extend over the entire length of the spoiler unit  22   h . The support webs  72   h ,  74   h  prevent a movement of the spring element  16   h  in a vertical direction  102   h . The vertical direction  102   h  extends perpendicular to the longitudinal direction and perpendicular to the wiping direction  88   h.    
     The spring element  16   h  is let into the longitudinal guidance channel  14   h . The spring element  16   h  is made from spring steel and is provided to form the holding unit  10   h  in an elastically deflectable manner. 
     For assembly, first the spring element  16   h  is introduced into the longitudinal guidance channel  14   h . Then the wiper blade  40   h  is pushed into the piping rail  70   h  and creates a form fit with the holding element  12   h . The spoiler unit  22   h  is now pushed over the holding element  12   h  and is then connected therewith by form fit. 
       FIG. 9  shows a cross section view of a further exemplary embodiment of a wiping device according to the invention with a holding unit  10   i  with a holding element  12   i  having a longitudinal guidance channel  14   i  to guide a spring element  16   i , and a spoiler unit  22   i . The section plane runs perpendicular to a longitudinal direction of the holding element  12   i.    
     The longitudinal guidance channel  14   i  is formed as a trough. The longitudinal guidance channel  14   i  is open over the entire width and length in the direction of the spoiler unit  22   i.    
     To guide the spring element  16   i , the longitudinal guidance channel  14   i  has side walls  52   i ,  54   i . Furthermore an intermediate wall  56   i  is arranged on the side walls  52   i ,  54   i  which terminates the longitudinal guidance channel  14   i  in the direction of a wiper blade  40   i . The side walls  52   i ,  54   i  extend from the intermediate wall  56   i  in a direction away from the wiper blade  40   i . The holding element  12   i  has a longitudinal opening  84   i  which opens the longitudinal guidance channel  14   i  completely towards the spoiler unit  22   i.    
     Two L-shaped guide profiles  58   i ,  60   i  of the holding unit  10   i  are arranged on the intermediate wall  56   i . The guide profiles  58   i ,  60   i  are formed integrally with the holding element  12   i . The guide profiles  58   i ,  60   i  each have a side guide  62   i ,  64   i  and a vertical guide  66   i ,  68   i . The vertical guides  66   i ,  68   i  enclose an angle of 90° with the respective side guides  62   i ,  64   i . The vertical guides  66   i ,  68   i  point towards each other. The side guides  62   i ,  64   i  each enclose an angle of 90° to the intermediate wall  56   i . The guide profiles  58   i ,  60   i  point in directions towards each other at their free ends of the vertical guides  66   i ,  68   i . The guide profiles  58   i ,  60   i  and the intermediate wall  56   i  form a piping rail  70   i  in which the wiper blade  40   i  is introduced. 
     The spoiler unit  22   i  is produced in a co-extrusion process from two spoiler part elements  32   i ,  34   i  of different hardness. The first spoiler part element  32   i  has two spoiler sides  76   i ,  78   i  which are formed concave towards the outside. To reinforce the spoiler unit  22   i , the first spoiler part element  32   i  has a connecting web  80   i  which joins together the concave spoiler sides  76   i ,  78   i . The connecting web  80   i  and the spoiler sides  76   i ,  78   i  surround a longitudinal channel  82   i  with a triangular cross section. 
     The first spoiler part element  32   i  is formed integrally with the second spoiler part element  34   i  and is provided to deflect travel wind. The second spoiler part element  34   i  has a greater strength and hardness than the first spoiler part element  32   i . The second spoiler part element  34   i  is formed integrally with the holding element  12   i  and made from a plastic. A person skilled in the art in this context will consider various plastics which appear suitable such as in particular polyethylene, polypropylene, polyamide, polyvinyl chloride and/or polystyrene. 
     Furthermore the second spoiler part element  34   i  has two support webs  72   i ,  74   i . The support webs  72   i ,  74   i  lie with their free ends on spring element  16   i  on a side facing away from the wiper blade  40   i . The support webs  72   i ,  74   i  are provided for transmitting contact forces which occur at the spoiler unit  22   i  when exposed to travel wind. The support webs  72   i ,  74   i  extend over the entire length of the spoiler unit  22   i . The support webs  72   i ,  74   i  prevent a movement of the spring element  16   i  in a vertical direction  102   i . The vertical direction  102   i  extends perpendicular to the longitudinal direction and perpendicular to the wiping direction  88   i.    
     The spring element  16   i  is let into the longitudinal guidance channel  14   i . The spring element  16   i  is made from spring steel and is provided to form the holding unit  10   i  in an elastically deflectable manner. 
     For assembly, first the spring element  16   i  is introduced into the longitudinal guidance channel  14   i . Then the wiper blade  40   i  is pushed into the piping rail  70   i  and creates a form fit with the holding element  12   i.    
       FIG. 10  shows a cross section view of a further exemplary embodiment of a wiping device according to the invention with a holding unit  10   j  with a holding element  12   j  having a longitudinal guidance channel  14   j  to guide a spring element  16   j , and a spoiler unit  22   j . The section plane runs perpendicular to a longitudinal direction of the holding element  12   j.    
     To guide the spring element  16   j , the longitudinal guidance channel  14   j  has side walls  52   j ,  54   j . Furthermore an intermediate wall  56   j  is arranged on the side walls  52   j ,  54   j  which terminates the longitudinal guidance channel  14   j  in the direction of a wiper blade  40   j . The side walls  52   j ,  54   j  extend from the intermediate wall  56   j  in a direction away from the wiper blade  40   j . A fixing means  98   j ,  100   j  is molded onto each side wall  52   j ,  54   j  and with its free end  108   j ,  110   j  faces the longitudinal guidance channel  14   j . The fixing means  98   j ,  100   j  are formed L-shaped and border the side walls  52   j ,  54   j  at an obtuse angle of 60°. 
     Two L-shaped guide profiles  58   j ,  60   j  of the holding unit  10   j  are arranged on the intermediate wall  56   j . The guide profiles  58   j ,  60   j  are formed integrally with the holding element  12   j . The guide profiles  58   j ,  60   j  each have a side guide  62   j ,  64   j  and a vertical guide  66   j ,  68   j . The vertical guides  66   j ,  68   j  enclose an angle of 90° with the respective side guides  62   j ,  64   j . The vertical guides  66   j ,  68   j  point towards each other. The side guides  62   j ,  64   j  each enclose an angle of 90° to the intermediate wall  56   j . The guide profiles  58   j ,  60   j  point in directions towards each other at their free ends of the vertical guides  66   j ,  68   j . The guide profiles  58   j ,  60   j  and the intermediate wall  56   j  form a piping rail  70   j  in which the wiper blade  40   j  is introduced. 
     The spoiler unit  22   j  is produced in a co-extrusion process from two spoiler part elements  32   j ,  34   j  of different hardness. The first spoiler part element  32   j  has two spoiler sides  76   j ,  78   j  which are formed concave towards the outside. To reinforce the spoiler unit  22   j , the first spoiler part element  32   j  has a connecting web  80   j  which joins together the concave spoiler sides  76   j ,  78   j . The connecting web  80   j  and the spoiler sides  76   j ,  78   j  surround a longitudinal channel  82   j  which has a substantially pentagonal cross section. 
     The first spoiler part element  32   j  is formed integrally with the second spoiler part element  34   j  and is provided to deflect travel wind. The second spoiler part element  34   j  has a greater strength and hardness than the first spoiler part element  32   j . The first spoiler part element  32   j  lies on two fixing webs  112   j ,  114   j  which are formed integrally with the connecting web  80   j . The fixing webs  112   j ,  114   j  enclose an angle of 60° with the connecting web  80   j . The second spoiler part element  34   j  has two fixing grooves  104   j ,  106   j  which create a form fit with the fixing means  98   j ,  100   j.    
     The holding element  12   j  is produced integrally from polyethylene in an extrusion process. A person skilled in the art in this context will consider various plastics which appear suitable such as in particular polypropylene, polyamide, polyvinyl chloride and/or polystyrene. 
     The free ends  108   j ,  110   j  of the fixing means  98   j ,  100   j  are surrounded by the second spoiler part element  34   j . The harder spoiler part element  34   j  here lies on the fixing means  98   j ,  100   j  by form fit. The harder spoiler part element  34   j  has two support bodies  48   j ,  50   j  which lie on the fixing means  98   j ,  100   j  and on the spring element  16   j . A connecting web  80   j  joins the support bodies  48   j ,  50   j  together. 
     The spring element  16   j  is let into the longitudinal guidance channel  14   j . The spring element  16   j  is made from spring steel and is provided to form the holding unit  10   j  in an elastically deflectable manner. 
     For assembly, first the spring element  16   j  is introduced into the longitudinal guidance channel  14   j . Then the wiper blade  40   j  is pushed into the piping rail  70   j  and creates a form fit with the holding element  12   j . The spoiler unit  22   j  is now pushed into the holding element  12   j  and is then connected therewith by form fit. 
       FIG. 11  shows a cross section view of a further exemplary embodiment of a wiping device according to the invention with a holding unit  10   k  with a holding element  12   k  having a longitudinal guidance channel  14   k  to guide a spring element  16   k , and a spoiler unit  22   k . The section plane runs perpendicular to a longitudinal direction of the holding element  12   k . The wiping device shown substantially corresponds to the exemplary embodiment shown in  FIG. 10 . 
     The holding element  12   k  has two channel walls  36   k ,  38   k  which border the longitudinal guidance channel  14   k . The channel walls  36   k ,  38   k  extend parallel to a wiping direction  88   k  and partially terminate the longitudinal guidance channel  14   k  in a direction facing away from the wiper blade  40   k . The holding element  12   k  furthermore has a longitudinal opening  84   k  which opens the longitudinal guidance channel  14   k  towards the spoiler unit  22   k.    
     The spoiler unit  22   k  is produced in a co-extrusion process from two spoiler part elements  32   k ,  34   k  of different hardness. The first spoiler part element  32   k  has two spoiler sides  76   k ,  78   k  which are formed concave towards the outside. To reinforce the spoiler unit  22   k , the first spoiler part element  32   k  has a connecting web  80   k  which joins together the concave spoiler sides  76   k ,  78   k . The connecting web  80   k  and the spoiler sides  76   k ,  78   k  surround a longitudinal channel  82   k  which has a substantially pentagonal cross section. 
     The harder spoiler part element  34   k  has two support bodies  48   k ,  50   k  which lie on the fixing means  98   k ,  100   k  and on the channel walls  36   k ,  38   k . A connecting web  80   k  joins the support bodies  48   k ,  50   k  together. The connecting web  80   k  lies on the channel walls  36   k ,  38   k . The first spoiler part element  32   k  lies on two fixing webs  112   k ,  114   k  which are formed integrally with the connecting web  80   k . The fixing webs  112   k ,  114   k  enclose an angle of 60° with the connecting web  80   k . A width of the first spoiler part element  32   k  corresponds to twice the width of the fixing webs  112   k ,  114   k.    
       FIG. 12  shows a cross section view of a further exemplary embodiment of a wiping device according to the invention with a holding unit  10   l  with a holding element  12   l  having a longitudinal guidance channel  14   l  to guide a spring element  16   l . The section plane runs perpendicular to a longitudinal direction of the holding element  12   l . The wiping device shown substantially corresponds to the exemplary embodiment shown in  FIG. 11 . A width of a first spoiler part element  32   l  corresponds to the width of the fixing webs  112   l ,  114   l . The first spoiler part element  32   l  runs together pointed in an end region  116   l  facing away from the wiper blade  40   l.    
       FIG. 13  shows a cross section view of a further exemplary embodiment of a wiping device according to the invention with a holding unit  10   m  with a holding element  12   m  having a longitudinal guidance channel  14   m  to guide a spring element  16   m , and a spoiler unit  22   m . The section plane runs perpendicular to a longitudinal direction of the holding element  12   m . The wiping device shown substantially corresponds to the exemplary embodiment shown in  FIG. 12 . A width of a first spoiler part element  32   m  corresponds to the width of the fixing webs  112   m ,  114   m . The first spoiler part element  32   m  runs together rounded in an end region  116   m  facing away from a wiper blade  40   m.    
       FIG. 14  shows a cross section view of a further exemplary embodiment of a wiping device according to the invention with a holding unit  10   n  with a holding element  12   n  having a longitudinal guidance channel  14   n  to guide a spring element  16   n . The section plane runs perpendicular to a longitudinal direction of the holding element  12   n.    
     To guide the spring element  16   n , the longitudinal guidance channel  14   n  has side walls  52   n ,  54   n . Furthermore an intermediate wall  56   n  is arranged on the side walls  52   n ,  54   n  which terminates the longitudinal guidance channel  14   n  in the direction of a wiper blade  40   n . The side walls  52   n ,  54   n  extend from the intermediate wall  56   n  in a direction away from the wiper blade  40   n . A second intermediate wall  118   n  terminates the longitudinal guidance channel  14   n  in the direction of a spoiler unit  22   n . Thus the longitudinal guidance channel  14   n  is completely surrounded. 
     Two L-shaped guide profiles  58   n ,  60   n  of the holding unit  10   n  are arranged on the intermediate wall  56   n . The guide profiles  58   n ,  60   n  are formed integrally with the holding element  12   n . The guide profiles  58   n ,  60   n  each have a side guide  62   n ,  64   n  and a vertical guide  66   n ,  68   n . The vertical guides  66   n ,  68   n  enclose an angle of 90° with the respective side guides  62   n ,  64   n . The vertical guides  66   n ,  68   n  point towards each other. The side guides  62   n ,  64   n  each enclose an angle of 90° to the intermediate wall  56   n . The guide profiles  58   n ,  60   n  point in directions towards each other at their free ends of the vertical guides  66   n ,  68   n . The guide profiles  58   n ,  60   n  and the intermediate wall  56   n  form a piping rail  70   n  in which the wiper blade  40   n  is introduced. 
     The spoiler unit  22   n  is produced in a co-extrusion process from two spoiler part elements  32   n ,  34   n ,  42   n  of different hardness. The first spoiler part element  32   n  has two spoiler sides  76   n ,  78   n  which are formed concave towards the outside. To reinforce the spoiler unit  22   n , the first spoiler part element  32   n  has a connecting web  80   n  which joins together the concave spoiler sides  76   n ,  78   n . The connecting web  80   n  and the spoiler sides  76   n ,  78   n  surround a longitudinal channel  82   n  which has a substantially pentagonal cross section. 
     The first spoiler part element  32   n  is formed integrally with the second spoiler part element  34   n ,  42   n  and is provided to deflect travel wind. The second spoiler part element  34   n ,  42   n  has a greater strength and hardness than the first spoiler part element  32   n.    
     The second spoiler part elements  34   n ,  42   n  lie on the holding element  12   n  by form fit in the region of the longitudinal guidance channel  14   n  and partially surround the longitudinal guidance channel  14   n . The second spoiler part elements  34   n ,  42   n  each have three walls. The first and second walls enclose an angle of 90°. The second wall encloses an angle of 77° with the third wall, which can lead to a high torsional rigidity. 
     The second spoiler part elements  34   n ,  42   n  are surrounded by the first spoiler part element  32   n  in both a wiping direction  88   n  and a vertical direction  102   n . Contact of the second spoiler part elements  34   n ,  42   n  with an environment is thus avoided. 
     The holding element  12   n  is produced integrally from polyethylene in an extrusion process. A person skilled in the art in this context will consider various plastics which appear suitable such as in particular polypropylene, polyamide, polyvinyl chloride and/or polystyrene. 
     The spring element  16   n  is let into the longitudinal guidance channel  14   n . The spring element  16   n  is made from spring steel and is provided to form the holding unit  10   n  in an elastically deflectable manner. 
     For assembly, first the spring element  16   n  is introduced into the longitudinal guidance channel  14   n . Then the wiper blade  40   n  is pushed into the piping rail  70   n  and creates a form fit with the holding element  12   n . The spoiler unit  22   n  is now pushed over the holding element  12   n  and is then connected therewith by form fit. 
       FIG. 15  shows a cross section view of a further exemplary embodiment of a wiping device according to the invention with a holding unit  10   o  with a holding element  12   o  having a longitudinal guidance channel  14   o  to guide a spring element  16   o . The section plane runs perpendicular to a longitudinal direction of the holding element  12   o.    
     The holding element  12   o  has two fixing elements  18   o ,  20   o . The fixing elements  18   o ,  20   o  are formed integrally with the holding element  12   o . At their free ends  24   o ,  26   o , the fixing elements  18   o ,  20   o  point in directions away from each other. Furthermore the fixing elements  18   o ,  20   o  form two channel walls  36   o ,  38   o  which border the longitudinal guidance channel  14   o  on a side facing away from the wiper blade. In the region of their free ends  24   o ,  26   o , the fixing elements  18   o ,  20   o  are formed as piping. The ends  24   o ,  26   o  are surrounded by a spoiler unit  22   o . For this the spoiler unit  22   o  has two fixing means  44   o ,  46   o . The fixing means  44   o ,  46   o  each form a C-shaped receiving region and hence a piping rail. 
     To guide the spring element  16   o , side walls  52   o ,  54   o  of the longitudinal guidance channel  14   o  border the channel walls  36   o ,  380 . The channel walls  36   o ,  38   o  here enclose a right angle with the side walls  52   o ,  54   o . Furthermore an intermediate wall  56   o  is arranged on the side walls  52   o ,  54   o  which terminates the longitudinal guidance channel  14   o  in the direction of a wiper blade  40   o . The side walls  52   o ,  54   o  extend from the intermediate wall  56   o  in a direction away from the wiper blade  40   o . The holding element  12   o  has a longitudinal opening  84   o  which opens the longitudinal guidance channel  14   o  towards the spoiler unit  22   o.    
     Two L-shaped guide profiles  58   o ,  60   o  of the holding unit  10   o  are arranged on the intermediate wall  56   o . The guide profiles  58   o ,  60   o  are formed integrally with the holding element  12   o . The guide profiles  58   o ,  60   o  each have a side guide  62   o ,  64   o  and a vertical guide  66   o ,  680 . The vertical guides  66   o ,  68   o  enclose an angle of 90° with the respective side guides  62   o ,  64   o . The vertical guides  66   o ,  68   o  point towards each other. The side guides  62   o ,  64   o  each enclose an angle of 90° to the intermediate wall  56   o . The guide profiles  58   o ,  60   o  point in directions towards each other at their free ends of the vertical guides  66   o ,  680 . The guide profiles  58   o ,  60   o  and the intermediate wall  56   o  form a piping rail  70   o  in which the wiper blade  40   o  is introduced. 
     The holding element  12   o  is produced integrally from polyethylene in an extrusion process. A person skilled in the art in this context will consider various plastics which appear suitable such as in particular polypropylene, polyamide, polyvinyl chloride and/or polystyrene. 
     The spoiler unit  22   o  is produced in a co-extrusion process from two spoiler part elements  32   o ,  34   o ,  42   o  of different hardness. The first spoiler part element  32   o  has two spoiler sides  76   o ,  78   o  which are formed concave towards the outside. The softer spoiler part element  32   o  and the harder spoiler part elements  34   o ,  42   o  are joined together by material fit over a wide area. To reinforce the spoiler unit  22   o , the first spoiler part element  32   o  has a connecting web  80   o  which joins together the concave spoiler sides  76   o ,  780 . The softer spoiler part element  32   o  surrounds a longitudinal channel  82   o  which has a pentagonal cross section. 
     The first spoiler part element  32   o  is formed integrally with the second spoiler part elements  34   o ,  42   o  and is provided to deflect travel wind. The spoiler part elements  34   o ,  42   o  have a greater strength and hardness than the first spoiler part element  32   o . The spoiler part elements  34   o ,  42   o  are formed separately from each other. The spoiler part element  34   o  forms the fixing means  44   o . The spoiler part element  42   o  forms the fixing means  46   o . The fixing means  44   o ,  46   o  are formed circular and lie by form fit on the fixing elements  18   o ,  20   o . The spring element  16   o  is let into the longitudinal guidance channel  14   o . The spring element  16   o  is made from spring steel and is provided to form the holding unit  10   o  in an elastically deflectable manner. 
     For assembly, first the spring element  16   o  is introduced into the longitudinal guidance channel  14   o . Then the wiper blade  40   o  is pushed into the piping rail  70   o  and creates a form fit with the holding element  12   o . The spoiler unit  22   o  is now pushed over the fixing elements  18   o ,  20   o  and is then connected therewith by form fit. 
       FIG. 16  shows a cross section view of a further exemplary embodiment of a wiping device according to the invention with a holding unit  10   p  with a holding element  12   p  having a longitudinal guidance channel  14   p  to guide a spring element  16   p . The section plane runs perpendicular to a longitudinal direction of the holding element  12   p . The wiping device shown substantially corresponds to the exemplary embodiment shown in  FIG. 15 . 
     A spoiler unit  22   p  is formed in a co-extrusion process from two spoiler part elements  32   p ,  34   p  of different hardness. The first spoiler part element  32   p  has two spoiler sides  76   p ,  78   p  which are formed concave towards the outside. The softer spoiler part element  32   p  and the harder spoiler part element  34   p  are joined together by material fit over a wide area. To reinforce the spoiler unit  22   p , the first spoiler part element  32   p  has a connecting web  80   p  which joins together the concave spoiler sides  76   p ,  78   p . The softer spoiler part element  32   p  surrounds a longitudinal channel  82   p  which has a pentagonal cross section. 
     The spoiler unit  22   p  has two fixing means  44   p ,  46   p . The fixing means  44   p ,  46   p  each form a C-shaped receiving region and hence a piping rail. The fixing means  44   p ,  46   p  are joined together via a second connecting web  30   p . The fixing means  44   p ,  46   p  and the connecting web  30   p  are formed integrally.