Pulsed wiper and wiper configuration

Abstract

The invention relates to a pulse wiper (20) and a wiper arrangement for wiping foreign matter (19) from a mating surface (28) of a machine component. The pulse wiper comprises a holding section (22) and a wiping lip (24) with a wiping edge (26) which extends around a central axis Z of the pulse wiper and is used for dynamically contacting and wiping foreign matters (19) on the mating surface (28). According to the invention, the wiper lip (24) can be elastically deformed and has, on the peripheral side thereof facing away from the holding section (22), one or more material weakening sections which preferably extend in a ring-shaped manner and which each define a desired bending zone (36) of the wiper lip (24), the wiper lip (24) forming a functional axial stop (38) for the longitudinal sections (24a, 24b) of the wiper lip (24), the longitudinal section is always arranged at the distal end of the axial stop (38). Alternatively, the wiper lip (24) is arranged on a carrier element (44), the axial deflection movement of which relative to the holding section (22) is limited by an at least functional axial stop. The invention also relates to a wiper arrangement (10).

Description

Technical Field

[0001] The invention relates to an impulse wiper and a wiper arrangement. Wipers are already known in many technical fields, in particular for scraping dirt, shavings, moisture and other foreign particles off a piston or a piston rod before it returns to the cylinder. This prevents the bearing gaps between the components or the hydraulic medium from becoming contaminated and prevents guides, seals and other components of the wiper arrangement from being damaged. Such wiper arrangements are, for example, key components of hydraulic systems for cranes and other construction machines. So-called compound wipers or tandem wipers with two or more wiper lips, which can have identical or opposite main action directions, are also available on the market. Background Art

[0002] Such wipers must have favorable friction properties in terms of the material pairing with the mating surface to be wiped and the greatest possible wear resistance. The wipers used in practice sometimes cannot or only incompletely wipe off foreign particles, in particular ice or dried-on dirt, which adhere firmly to the piston rod. In this case, the above-mentioned impurities may enter the bearing gap. Summary of the invention

[0003] Therefore, an object of the present invention is to provide a wiper and a wiper arrangement that can more reliably wipe off problematic foreign matter that is firmly attached to a scraped mating surface of a machine component.

[0004] According to the invention, the object in relation to the wiper is achieved by an impulse wiper as claimed in claim 1. The wiper arrangement has the features given in claim 17. Further advantages of the invention can be gathered from the description and the drawings.

[0005] The impulse wiper according to the present invention is configured to wipe foreign matter from a mating surface of a machine component (particularly a piston rod), and comprises a retaining section for mounting the impulse wiper in / on a retaining structure (particularly a retaining groove) of the machine component. The impulse wiper further comprises a wiper lip having a wiper edge, which extends circumferentially relative to a central axis Z of the impulse wiper and is used to dynamically contact and wipe foreign matter on a mating surface of another machine component.

[0006] According to a first alternative embodiment of the invention, the wiper lip itself is elastically deformable and has one or more material weakenings, preferably extending in an annular manner, on its circumferential side facing away from the retaining section, each of which defines a rated bending zone of the wiper lip, wherein the wiper lip itself forms a functional axial stop for a longitudinal section of the wiper lip, which longitudinal section is always arranged at the distal end of the axial stop.

[0007] According to a second alternative embodiment of the invention, the wiper lip is arranged on a support element, the axial pivoting movement of which relative to the holding section is limited by an axial stop.

[0008] If, during the operation of the impulse wiper, foreign matter attached to the piston rod - due to the (return) movement of the piston rod - encounters the wiping edge of the impulse wiper, this triggers an axial deformation or deflection movement of the wiper lip, which is suddenly limited or suppressed by the axial stop. In this way, a mechanical wiping pulse or a separating force can be applied to the foreign matter by the wiper lip. By means of this wiping pulse or this separating force, even problematic foreign matter such as ice, dried-on dirt, which is particularly firmly attached to the piston rod, can be removed from the piston rod more reliably, i.e. wiped. During the return movement of the piston rod, this can more reliably prevent such foreign matter from entering the bearing gap undesirably. Overall, this is beneficial to the function and life of the wiper arrangement provided with an impulse wiper. In this regard, impulse wipers are particularly suitable for critical applications such as construction machinery, cranes, etc., in which failures of the wiper arrangement must be unconditionally prevented in order to avoid possible personal injury or property damage.

[0009] In principle, the stop of the second alternative embodiment of the invention can be formed by an additional component, by which the axial movement of the wiper lip in the direction opposite to the main action direction of its wiper edge (i.e. in the direction H towards the inside of the bearing gap or sealing gap of the wiper configuration in the installed state) is limited. However, according to a preferred further development of the invention, the support element itself is spring-elastically deformable and has an exponentially increasing spring characteristic curve in terms of axial deformation (countering the main action direction of the wiper edge), so that the aforementioned axial stop is functionally realized or defined by the support element itself. In other words, the support element is designed as a spring component with an increasing spring characteristic curve in this case. In this way, the impulse wiper can be realized cost-effectively with a small number of components and can be used for any existing wiper configuration. As an alternative or supplement, the functional axial stop can be formed / defined by the retaining section of the impulse wiper. In this case, the retaining section itself is spring-elastically deformable and has an exponentially increasing spring characteristic curve in terms of its axial deformation, and the axial stop is functionally realized or defined by this exponentially increasing spring characteristic curve. By way of example, the retaining component may include or be formed from an elastomeric material.

[0010] According to a further design of the invention, the carrier element of the impulse wiper can be designed in particular as a reinforcement insert for the wiper lip. In this case, the wiper lip can be formed on the reinforcement insert by injection molding, which has advantages in terms of manufacturing technology. In addition, a particularly reliable mechanical connection between the two components can be achieved thereby.

[0011] According to the invention, the carrier element can extend radially to or almost to the height of the wiper edge. In this way, even if foreign bodies axially pass over the wiper edge during operation of the impulse wiper, the carrier element can act as an additional wiper or as a barrier to prevent the foreign bodies from entering the bearing gap further in the axial direction. In this regard, the carrier element can also have an active edge for wiping foreign bodies, which is preferably designed as a sharp edge. This ensures that foreign bodies can be separated from the piston rod more reliably.

[0012] According to the invention, the carrier element can in particular be made of metal, plastic or a composite material.

[0013] The wiper edge can be produced in particular from a material having a Shore hardness between 80 Shore A and 70 Shore D.

[0014] The support element can be articulated only in a spring-elastic manner on the holding section of the impulse wiper or can also be furthermore spring-elastically deformable itself.

[0015] According to the invention, the material weakening of the wiper lip can be designed in particular as an annular notch or an annular groove, wherein the groove wall of the annular groove facing the wiper edge serves as a stop surface for the longitudinal section of the wiper lip arranged distal to the material weakening. Such an embodiment of an impulse wiper can be produced particularly cost-effectively, for example by injection molding.

[0016] According to a particularly preferred further development of the invention, the wiper lip has a plurality of material weakenings or annular grooves which are arranged spaced apart from one another in the axial direction relative to the central axis of the impulse wiper, wherein the annular grooves can have a depth and / or an axial width which increases as the distance between the annular groove and the wiper edge increases.

[0017] According to a particularly preferred embodiment of the invention, each material weakening of the wiper lip tapers or narrows radially in the direction of the holding section, thereby making it possible to adjust the response behavior of the wiper lip to axial forces acting on the wiper edge particularly easily and reliably.

[0018] In order to further improve the wiping ability of the impulse wiper, the wiping edge can be designed to be corrugated or serrated in the circumferential direction of the impulse wiper. This can minimize the contact area of ​​the wiping edge with foreign matter and can apply a particularly large wiping force.

[0019] The impulse wiper can further include a second wiper lip, which has either a main action direction that coincides with the first wiper edge or a main action direction that is opposite to the first wiper edge. In the former case, the wiping effect of the impulse wiper in the main action direction of the first wiper edge can be enhanced, while in the other case, foreign bodies that have entered the bearing gap or lubricant disposed in the bearing gap can be intercepted.

[0020] If there is a radially extending annular gap between each of the two wiper lips of the impulse wiper, foreign bodies and the like can be caught there. A gap is understood to be a spatial volume in which no components of the impulse wiper are arranged.

[0021] The wiper lip may further have a support component arranged axially spaced from the wiper edge, the support segment extending radially away from the wiper lip. The impulse wiper can be supported on the mating surface by the support component, thereby counteracting undesirable tilting moments acting on the impulse wiper. The support component is preferably formed on the wiper lip. The support component preferably has a spherical cross-sectional shape.

[0022] The wiper arrangement according to the invention comprises a first machine part in the form of a piston or a piston rod and a second machine part, preferably in the form of a cylinder, surrounding the first machine part. The two machine parts are arranged at a distance from each other to form a bearing gap and can move relative to each other along the axis of motion. One of the two machine parts has a sliding surface or a mating surface, and the other of the two machine parts has a retaining structure, in particular in the form of a retaining groove, in which the retaining section of the above-mentioned impulse wiper is retained. The wiper lip of the impulse wiper at least partially (circumferentially) rests against the mating surface of one of the machine parts. If the wiper lip has one or more of the above-mentioned material weakenings / annular grooves, the lubricating liquid placed in the bearing gap can be dragged into each material weakening by the forward movement of one of the machine parts. The return movement of the machine part causes the wiper lip to deform due to friction, so that the lubricant is pressed out radially from each material weakening or annular groove of the wiper lip in the direction of the mating surface. Therefore, each material weakening or annular groove has a dual function.

[0023] The present invention will be described in detail below by means of the embodiments shown in the drawings. The embodiments shown and described should not be understood as an exhaustive enumeration, but rather as an illustrative description of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In the attached figure:

[0025] Figure 1 a partial sectional view of a wiper arrangement with a piston rod and a machine part surrounding the piston rod, here a cylinder, and an impulse wiper for the piston rod arranged between the two machine parts, wherein the impulse wiper has a circumferential material weakening in the form of an annular notch (= annular groove), by which a desired bending point of the wiper lip is defined and a stop for a longitudinal section of the wiper lip arranged distally from the annular notch;

[0026] Figure 2 is a cross-sectional view of a pulse wiper, which is Figure 1The impulse wiper shown differs essentially in that it has material weakenings on the circumference in the form of a plurality of annular notches which are arranged at a distance from one another and of different sizes;

[0027] Figure 3 A partial cross-sectional view of another impulse wiper, wherein the wiper lip has a support element having an exponentially increasing spring characteristic curve;

[0028] Figure 4 A partial sectional view of another impulse wiper, whose wiper lip has two wiper edges with opposite main action directions and a support element, which has an exponentially increasing spring characteristic curve;

[0029] Figure 5 Another impulse wiper, whose wiper lip is fastened to the holding section only by a support element, wherein the holding assembly has an exponentially increasing spring characteristic curve and forms a functional stop for the axial deflection movement of the support element articulated on the holding section and the wiper lip;

[0030] Figure 6 is a partial sectional view of another impulse wiper, whose wiper lip is fastened to the holding section only by a support element, wherein the holding assembly has an exponentially increasing spring characteristic curve and forms a functional stop for the axial deflection movement of the support element and the wiper lip which are articulated on the holding section;

[0031] Figure 7 A detailed perspective view of a notched wiping edge of an impulse wiper;

[0032] Figure 8 A detailed perspective view of a wave-shaped wiper edge of a pulse wiper; and

[0033] Fig. 9 Based on Figure 5 The holding component or according to Figure 3 , Figure 4 and Figure 6 Exponentially increasing spring characteristic curve of the load-bearing element. DETAILED DESCRIPTION

[0034] Figure 1 A first embodiment of a wiper arrangement 10 according to the invention is shown. The wiper arrangement 10 comprises a first machine part 12, here exemplarily in the form of a piston rod, and a second machine part 14, here exemplarily in the form of a cylinder, which surrounds the piston rod. The two machine parts 12, 14 are arranged spaced apart from one another to form a bearing gap 16 arranged between the two machine parts 12, 14. The wiper arrangement 10 or the bearing gap 16 has an outer side N and an inner side H. The lubricant ( Figure 1The first machine part 12 can be moved back and forth relative to the second machine part 14 along the movement axis L. The forward movement of the piston rod is marked with V and the return movement of the piston rod is marked with R.

[0035] The second machine part 14 has a retaining structure 18 which is designed here as a retaining groove. The impulse wiper 20 serves to wipe off impurities or foreign bodies 19 adhering to the piston rod.

[0036] The impulse wiper 20 has a mounting section or holding section 22 arranged in a holding groove of the second machine part 14. The wiper lip 24 extends away from the holding section 22 in the axial direction relative to the central axis Z of the impulse wiper 20. The wiper lip 24 is provided with a single wiper edge 26 which is closed around the circumference of the impulse wiper 20 and whose function is to dynamically contact and wipe the mating surface 28 of the piston rod. The edge angle α of the wiper edge 26 in the axial direction toward the outside N is between 50° and 75°, and the edge angle β in the axial direction toward the inside H is between 15° and 45°. The functional main direction of action of the wiper edge is indicated by the arrow 30.

[0037] according to Figure 1 The wiper lip 24 has a single material weakening extending annularly around the wiper lip 24 on its circumferential side 32 facing away from the holding section 22 (i.e., radially inside). The axial width b and radial depth t of the annular groove 34 are at least 30% of the local thickness d of the wiper lip 24.

[0038] The material weakening or annular groove 34 has three functions:

[0039] If, during operation, foreign matter 19 such as snow, chips, ice, dirt, etc. attached to the piston rod mating surface meets the wiper lip during the return movement of the piston rod, an axial force F is applied to the wiper lip. A The material weakening serves as a desired bending zone 36 for the wiper lip 24. The axial force F A This results in an axial elastic deformation (=compression) of the wiper lip 24 and in a bending (bending) of the wiper lip 24 , preferably in the region of the desired bending zone 36 .

[0040] Secondly, the material weakening forms an integral stop 38 for the longitudinal section 24a of the wiper lip 24, which is arranged distally, i.e. axially in the main action direction of the associated wiper edge. The integral stop 38 is formed by the first groove wall 34a of the annular groove 34, which faces the outer side N. This prevents the wiper lip 24 from further axial deformation when the distal longitudinal section 24a of the wiper lip 24 strikes the opposing first groove wall 34a with the second groove wall 34b facing the bearing gap 16. Due to the sudden increase in resistance to further deformation, the wiper pulse or separating force generated by the return movement R of the piston rod will act on the wiper edge 26. When the foreign body 19 or multiple foreign bodies 19 are Figure 1 When disengaged in the normal operating state shown, the sealing lip suddenly returns to its original shape in the radial / axial direction. Overall, foreign bodies 19 on the piston rod can be wiped off particularly effectively in this way. This reliably prevents foreign particles 19 from entering the bearing gap 16 and the associated risk of damage to other components of the wiper arrangement 10.

[0041] Third, the material weakening portion can be used as a lubricant reservoir 40. When the piston rod performs a forward motion V, the lubricating fluid attached to the piston rod can be sent or pulled into the material weakening portion or the annular groove 34. When the piston rod performs a return motion R, at least a portion of the lubricating fluid stored in the material weakening portion can be released to the piston rod again. This is especially true if the wiper lip 24 is axially deformed due to the friction between the wiper edge 26 and the piston rod mating surface 28, resulting in a reduction in the axial width b of the material weakening portion, that is, the lubricating fluid is squeezed out of the material weakening portion. In the subsequent forward motion V, the material weakening portion will be filled with lubricant again. This can further improve the circumferential lubrication effect of the piston rod or the wiper lip. In this way, even when the piston rod extends from the second machine part 14, it is particularly reliable to prevent the undesired adhesion of rust film and the like and to prevent the piston rod itself from being corroded.

[0042] It should be noted that the impulse wiper 20 can have a support section 42 which is arranged axially spaced from the wiper edge 26 and (at least temporarily) rests against the mating surface 28. During operation, the support section 42 can be supported on the mating surface 28, thereby counteracting the tilting moment acting on the impulse wiper 20. The support section 42 is designed here purely by way of example as a spherical annular projection which has no sealing effect and can completely have one or more axial channels in the circumferential direction. Other geometric designs of the support section are easily conceivable.

[0043] according to Figure 2In the embodiment shown, the wiper lip 24 of the impulse wiper 20 can also have a plurality of material weakenings arranged in an axial direction and spaced from each other. Each material weakening is preferably designed as an annular groove 34 and has the above-mentioned functional advantages. During normal operation of the impulse wiper 20, each material weakening or annular groove 34 of the wiper lip 24 can be narrowed in the radial direction. The depth t of the material weakening can increase as the distance between the material weakening and the wiper edge 26 increases.

[0044] It should be noted that the material weakening can also be formed by or filled with a highly compressible soft material having a lower modulus of elasticity than the rest of the wiper lip 24. Open-cell elastomeric foams are particularly suitable for this.

[0045] according to Figure 3 In the illustrated embodiment, the wiper lip 24 of the impulse wiper 20 is held on a carrier element 44. The carrier element 44 can be designed as a reinforcement insert for the wiper lip 24. Specifically, the wiper lip can be formed on the carrier element by injection molding. The carrier element 44 here extends radially from the retaining section 22 to or almost to the height of the wiper edge 26. It should be noted that the material of the carrier element 44 can have a larger elastic modulus than the material of the rest of the wiper lip 24. The carrier element 44 can include metal 25, plastic and / or a composite material or be made of one of these materials. The carrier element 44 itself can be deformed in a spring-elastic manner and has an exponentially increasing spring characteristic curve in terms of axial deformation, please also refer to the following description. Figure 8 Thus, the load-bearing element 44 acts as a spring-elastic energy store with a progressive spring characteristic curve. In other words, the axial force F required for the axial deformation of the load-bearing element A As the deformation of the support element increases, it suddenly increases. This functionally produces an axial stop effect on the axial deformation of the support element 44, thereby inducing an axial deflection movement of the wiper lip 24 in the inner direction H, through which a wiper pulse or a separation torque generated by the return movement of the piston rod can be applied to foreign matter attached to the piston rod.

[0046] If the elastic force of the bearing element 44 exceeds the axial force F when the foreign body 19 attached to the piston rod is scraped off (falls off), A The wiper lip 24 will rebound axially toward the outside N direction to its Figure 3 Working position shown.

[0047] In cross section, the wiper edge 26 may be in an arcuate basic shape convex toward the outside, and in the illustrated normal working state, may form an angle γ with the matching surface 28 of the piston rod, preferably 60°≤γ≤80°.

[0048] When the pulse wiper 20 is in the assembled state, Figure 4 In the detailed view shown, the support element 44 is also designed as a spring-elastically deformable reinforcement insert of the viscoplastic material of the wiper lip 24. In cross section, the support element 44 is designed here to have an arc-shaped cross-sectional shape. The wiper lip 24 has a second wiper edge 26, which is arranged axially offset inwardly in the direction H relative to the first wiper edge 26. The two wiper edges 26 are made of the same material. The second wiper edge 26 has an inward main action direction 30', which is opposite to the outward main action direction 30 of the first wiper edge 26.

[0049] It should be noted that the carrier element 44 itself may include an active edge 46 with a wiping function. The active edge 46 preferably does not contact the mating surface 28 during normal operation to avoid damage to the mating surface. In this regard, the active edge is preferably arranged to be separated from the mating surface 28 by only a small distance, for example less than 1 mm (in Figure 4 This makes it possible to more reliably prevent larger, in particular harder, foreign bodies 19 adhering to the first machine part 12 (=piston rod) from entering the bearing gap 16. If the wiper lip 24 has a gap 48 between the first and second wiper edges 26, such foreign bodies 19 and lubricant that have passed over the first wiper edge 26 can be received or deposited there.

[0050] Figure 5 Another impulse wiper 20 is shown, whose wiper lip 24 is fixed by a support element 44. One end of the support element 44 is hinged to the holding section 22 of the impulse wiper 20 in a spring-elastic manner. The support element 44 can counteract the axial force F that occurs during the operation of the impulse wiper. A Without bending, that is, basically without deformation, or according to the combination Figure 4 The embodiment described has an exponentially increasing spring characteristic curve. In this case, the holding section 22 itself can be elastically deformed in any case and has an exponentially increasing spring characteristic curve in terms of deformation. Figure 5 In the exemplary embodiment shown, an axial stop for an axial (pivoting) movement of the wiper lip is functionally produced by the retaining section 22. The retaining section 22 can comprise an elastomer or be produced from an elastomer, in particular.

[0051] The wiper lip 24 can have a first and a second wiper edge 26, whose main action directions 30, 30' can be opposite to each other. As a result, the impulse wiper is designed as a so-called compound wiper. The wiper lip 24 is made of a rubber-elastically deformable material or a visco-plastically deformable material, and the retaining section is preferably also made of a rubber-elastically deformable material or a visco-plastically deformable material. The Shore hardness of the soft material can in particular be between 80 Shore A and 70 Shore D.

[0052] The support element 44 extends radially into a gap 48 formed between the two wiper edges 26 to such an extent that the support element 44 almost contacts the counter surface 28 of the piston rod.

[0053] In the case of the impulse wiper 20, if the foreign body 19 adhering to the counter surface 28 encounters the wiper edge 26 / wiper lip 24 arranged on the outside during the return movement R of the piston rod, an axial force F acting on the wiper edge 26 is generated. A This axial force F A The support element together with the wiper lip 24 is elastically deflected relative to the holding section 22. This causes the wiper edge 26 to pivot toward the mating surface 28 with a greater amplitude. When the functional stop effect is achieved, that is, when the force required for the deformation of the holding component suddenly increases, a wiper pulse or a separating force is applied to the foreign body 19 via the wiper lip 24. If the elastic force of the holding component 22 exceeds the axial force F when the foreign body 19 leaves the mating surface 28, the wiping pulse or the separating force is applied to the foreign body 19 via the wiper lip 24. A The bearing element 44 will rebound axially together with the wiper lip 24 to its Figure 5 Initial position shown.

[0054] exist Figure 6 In the embodiment shown, the support element 44 is Figure 4 The embodiment shown is designed in a corresponding manner to extend in an arc shape and to serve as a spring-elastically deformable reinforcement insert for the wiper lip 24 and can be made of metal, viscoplastic hard plastic or composite material. The Shore hardness of the material of the support element 44 can be, for example, between 95 Shore A and 70 Shore D. The wiper lip 24 has three wiper edges 26, which are arranged axially spaced apart from one another and have mutually opposite main action directions 30, 30'. The material of the wiper lip is preferably softer or more viscoplastically deformable than the support element.

[0055] according to Figure 7 and Figure 8 The wiping edge 26 of the wiping lip 24 can be designed to be notched or wave-shaped and have a depression 50. The wiping function of the wiping lip 24 can be further improved thereby, in particular for particularly hard foreign bodies or foreign bodies that are particularly firmly attached to the mating surface.

[0056] Fig. 9 By way of example, Figure 3 , Figure 4 and Figure 6 The spring elastic bearing element 44 or according to Figure 5 The exponentially increasing characteristic curve K of the spring-elastic retaining section 22 is realized or formed by means of the exponentially increasing characteristic curve.

Claims

1. An impulse wiper (20) for wiping foreign matter (19) from a mating surface (28) of a machine component, comprising a holding section (22) for mounting the impulse wiper (20) in a holding structure (19) of a machine component (12, 14) and a wiping lip (24) having a wiping edge (26), the wiping edge extending circumferentially relative to a central axis Z of the impulse wiper (20) for dynamically contacting and wiping foreign matter (19) on a mating surface (28) of another machine component (12, 14), wherein the wiper lip (24) itself is elastically deformable and has one or more, preferably annularly extending, material weakenings on its circumferential side facing away from the retaining section (22), each of which defines a desired bending zone (36) of the wiper lip (24), wherein the wiper lip (24) itself forms an axial stop (38) for a longitudinal section (24a, 24b) of the wiper lip (24), which is accordingly arranged distal to the axial stop (38); or The wiper lip (24) is arranged on the holding section via a support element (44), wherein an axial pivoting movement of the support element relative to the holding section (22) is limited by means of an axial stop (38).

2. The pulse wiper according to claim 1, characterized in that: The support element (44) itself is spring-elastically deformable and has an exponentially increasing spring characteristic curve, by which the axial stop (38) is functionally realized.

3. The pulse wiper according to claim 1 or 2, characterized in that: The retaining section (22) itself is elastically deformable and has an exponentially increasing spring characteristic curve, by which the axial stop (38) is functionally realized.

4. The impulse wiper (20) according to any one of the preceding claims, characterized in that The carrier element (44) is a reinforcement insert of the wiper lip (24).

5. The impulse wiper (20) according to any one of the preceding claims, characterized in that The support element (44) extends in radial direction to or almost to the height of the wiper edge (26).

6. The impulse wiper (20) according to any one of the preceding claims, characterized in that The support element (44) comprises metal, plastic and / or a composite material or is made of one of these materials.

7. The impulse wiper (20) according to claim 1, characterized in that: The scraping edge (26) is made of a material having a hardness between 80 degrees Shore A and 70 degrees Shore D.

8. The impulse wiper (20) according to claim 1, characterized in that: The material weakening is designed as an annular groove (34), wherein a groove wall (34a) of the annular groove (34) facing the wiper edge (26) serves as a stop (38) for a longitudinal section (24a) of the wiper lip (24) arranged distally from the annular groove (34).

9. The impulse wiper (20) according to any one of the preceding claims, characterized in that The wiper edge (26) is embodied in a corrugated or serrated manner.

10. The impulse wiper (20) according to any one of the preceding claims, characterized in that The impulse wiper (20) has a plurality of wiper lips (24) and / or wiper edges (26).

11. The impulse wiper (20) according to claim 10, characterized in that The first and the second wiper lip (24) have main directions of action (30, 30') that are opposite to each other.

12. The impulse wiper (20) according to claim 10 or 11, characterized in that The carrier element (44) extends into an annular gap (48) arranged between the two wiper lips (24).

13. The impulse wiper (20) according to claim 1, characterized in that: The wiper lip (24) has a plurality of material weakenings which are arranged spaced apart from one another in the axial direction.

14. The impulse wiper (20) according to claim 13, characterized in that Each material weakening of the wiper lip (24) narrows in the radial direction.

15. The impulse wiper (20) according to claim 14, characterized in that The material weakenings each have a radial depth t which increases with increasing distance from the wiper edge (26).

16. The impulse wiper (20) according to any one of the preceding claims, characterized in that The impulse wiper (20) has a support section (44) axially spaced from the wiper edge (26) so as to be supported on the mating surface (28) when the impulse wiper (20) is in operation, thereby counteracting a tilting moment acting on the impulse wiper (20).

17. A wiper configuration (10), comprising a first machine part (12) and a second machine part (14) surrounding the first machine part (12), wherein the machine parts are arranged to be spaced apart from each other to form a bearing gap (16), wherein one of the two machine parts (12, 14) has a retaining structure, and a pulse wiper (20) as claimed in any of the preceding claims is arranged in a retaining manner in the retaining structure, wherein at least one wiper lip (24) of the pulse wiper (20) rests in dynamic contact on a mating surface (28) of the corresponding other machine part (12, 14).

18. The wiper arrangement (10) according to claim 17, characterized in that The axial force F acting on the wiper lip is caused by the foreign matter F attached to the mating surface (28). A The axial force causes the wiper lip (24) to deform and / or deflect in the axial direction relative to the retaining section (22) until a mechanical wiper pulse can be caused to act on the foreign body (19) through the stop (38) so as to wipe the foreign body (19) off the mating surface.

19. The wiper arrangement (10) according to claim 17 or 18, characterized in that The material weakening of the wiper lip (24) serves as a lubricant reservoir (40). When two machine parts (12, 14) move relative to each other, the wiper lip (24) is deformed or compressed due to friction, so that the lubricant is pressed out of the material weakening in the radial direction of the machine part (12, 14) having the mating surface (28).

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