Pulse wipers and wiper configurations

Abstract

The invention relates to an impulse wiper (20) and a wiper arrangement for wiping foreign bodies (19) from a mating surface (28) of a machine component. The impulse wiper comprises a holding section (22) and a wiper lip (24) having a wiper edge (26) which extends circumferentially relative to a central axis Z of the impulse wiper and is used for dynamically contacting and wiping foreign bodies (19) on the mating surface (28). The wiper lip itself is elastically deformable and has one or more material weakenings, preferably extending circumferentially in an annular manner, on its circumferential side facing away from the holding section (22), each of which defines a desired bending zone (36) of the wiper lip (24), wherein the wiper lip (24) itself forms a functional axial stop (38) for a longitudinal section (24a, 24b) of the wiper lip (24), which is always arranged distal to 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 retaining section (22) is limited by at least a functional axial stop. The invention also relates to a wiper arrangement (10).

Description

Technical Field

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

[0002] Such wipers must have favorable friction properties in combination with the material of the mating surface being wiped, as well as the greatest possible wear resistance. Wipers used in practice sometimes fail to wipe off, or only incompletely, foreign particles firmly adhering to the piston rod, particularly ice or dried-on dirt. In this case, the aforementioned impurities can 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 firmly attached to a mating surface to be wiped of a machine component.

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

[0005] The pulse 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 includes a retaining section for mounting the pulse wiper in / on a retaining structure (particularly a retaining groove) of the machine component. The pulse wiper further includes a wiper lip having a wiper edge that extends circumferentially relative to a central axis Z of the pulse wiper and is configured to dynamically contact and wipe foreign matter from 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, on its circumferential side facing away from the retaining section, one or more material weakenings, which preferably extend in an annular manner, each defining a desired 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 carrier element, the axial pivoting movement of which relative to the holding section is limited by an axial stop.

[0008] If, during operation of the impulse wiper, foreign matter adhering to the piston rod—due to the (return) movement of the piston rod—comes into contact with the wiping edge of the impulse wiper, this triggers an axial deformation or deflection of the wiper lip, which is abruptly limited or inhibited by an axial stop. This allows the wiper lip to exert a mechanical wiping pulse or separating force on the foreign matter. This wiping pulse or separating force allows even problematic foreign matter, such as ice or dried-on dirt, that is particularly firmly attached to the piston rod to be more reliably removed from the piston rod, i.e., wiped away. During the return movement of the piston rod, this further reliably prevents such foreign matter from undesirably entering the bearing gap. Overall, this benefits the functionality and lifespan of a wiper arrangement equipped with an impulse wiper. In this regard, impulse wipers are particularly suitable for critical applications such as construction machinery and cranes, where failure of the wiper arrangement must be absolutely prevented to avoid possible personal injury or property damage.

[0009] In principle, the stop of the second alternative embodiment of the present invention can be formed by an additional component, which limits the axial movement of the wiper lip counter to the main direction of action of its wiping edge (i.e., in the installed state, in the direction H toward the inside of the bearing gap or sealing gap of the wiper arrangement). However, according to a preferred further development of the present invention, the support element itself is spring-elastically deformable and has an exponentially increasing spring characteristic curve with respect to axial deformation (counter to the main direction of action of the wiper edge), thus functionally implementing or defining the aforementioned axial stop. In other words, the support element is designed as a spring assembly with an increasing spring characteristic curve. This allows for a cost-effective implementation of an impulse wiper with a small number of components and for use with any existing wiper arrangement. Alternatively or additionally, 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 with respect to its axial deformation, which functionally implements or defines the axial stop. For example, the retaining component may comprise or be formed from an elastomeric material.

[0010] According to a further embodiment 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 injection-molded onto the reinforcement insert, which offers advantages in terms of manufacturing technology. Furthermore, this allows for a particularly reliable mechanical connection between the two components.

[0011] According to the present invention, the support element can extend radially to or almost to the height of the wiper edge. This way, even if foreign matter axially passes over the wiper edge during operation of the impulse wiper, the support element can act as an additional wiper or barrier to prevent the foreign matter from further axially entering the bearing gap. In this regard, the support element can also have an active edge for wiping foreign matter, preferably designed as a sharp edge. This ensures more reliable separation of foreign matter from the piston rod.

[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 in particular be produced from a material having a Shore hardness between 80 Shore A and 70 Shore D.

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

[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 wiping edge serves as a stop surface for the longitudinal section of the wiper lip disposed distally from the material weakening. This embodiment of the impulse wiper can be produced particularly cost-effectively, for example using an injection molding process.

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

[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 retaining section, thereby making it possible to adjust the response of the wiper lip to axial forces acting on the wiper edge particularly simple and reliable.

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

[0019] The impulse wiper can further include a second wiper lip, which has a main direction of action that is aligned with the first wiper edge or opposite to the first wiper edge. In the former case, the wiping effect of the impulse wiper in the main direction of action of the first wiper edge can be enhanced, while in the other case, foreign matter that has entered the bearing gap or lubricant that has settled 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 objects and the like can be trapped 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 include a support element axially spaced from the wiper edge, with the support segment extending radially away from the wiper lip. The impulse wiper can be supported on the mating surface by this support element, thereby counteracting undesirable tilting moments acting on the impulse wiper. The support element is preferably formed on the wiper lip. The support element particularly 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 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 spaced apart from each other to form a bearing gap and are movable relative to each other along an axis of motion. One of the two machine parts has a sliding or 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 impulse wiper is retained. The wiper lip of the impulse wiper rests at least partially (circumferentially) 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 contained in the bearing gap can be drawn into each material weakening by the forward movement of one of the machine parts. The return movement of the machine parts causes the wiper lip to deform due to friction, thereby pressing the lubricant out of each material weakening or annular groove of the wiper lip radially towards 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 way 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 the pulse wiper, which is Figure 1The pulse wiper shown differs essentially in that it has a plurality of material weakenings in the form of annular notches on the circumference, which are arranged spaced apart from one another and of different sizes;

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

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

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

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

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

[0032] Figure 8 A detailed perspective view of the wavy wiping edge of a pulse wiper; and

[0033] Figure 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) surrounding 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 away impurities or foreign matter 19 adhering to the piston rod.

[0036] The impulse wiper 20 has a mounting section or retaining section 22 arranged in a retaining groove in the second machine part 14. A wiper lip 24 extends axially away from the retaining section 22 relative to the central axis Z of the impulse wiper 20. The wiper lip 24 is provided with a single, closed wiper edge 26 circumferentially around the circumference of the impulse wiper 20, 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, axially toward the outside N, is between 50° and 75°, and the edge angle β, axially toward the inside H, is between 15° and 45°. The functional main direction of action of the wiper edge is indicated by arrow 30.

[0037] according to Figure 1 The wiper lip 24 has, on its circumferential side 32 facing away from the retaining section 22 (i.e., radially inwardly), a single material weakening in the form of an annular groove 34 extending annularly around the wiper lip 24. 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, it will exert an axial force F on the wiper lip. A The material weakening serves as a desired bending zone 36 of 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 direction of action 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 outside N. 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, this prevents the wiper lip 24 from undergoing further axial deformation. Due to the sudden increase in resistance to further deformation, a wiping pulse or separating force resulting from the return movement R of the piston rod acts on the wiper edge 26. When the foreign body 19 or foreign bodies 19 are Figure 1 In the normal operating state shown, the sealing lip snaps back into its original shape in the radial / axial direction upon release. Overall, this allows particularly effective wiping of foreign matter 19 from the piston rod. 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 can serve as a lubricant reservoir 40. During the piston rod's forward stroke V, lubricating fluid adhering to the piston rod can be fed or drawn into the material weakening or annular groove 34. During the piston rod's return stroke R, at least some of the lubricating fluid stored in the material weakening can be released back onto the piston rod. This is particularly true if the wiper lip 24 deforms axially due to friction between the wiper edge 26 and the piston rod's mating surface 28, reducing the axial width b of the material weakening and, in other words, forcing the lubricating fluid out of the material weakening. During the subsequent forward stroke V, the material weakening is refilled with lubricant. This further improves the circumferential lubrication of the piston rod or wiper lip. This ensures particularly reliable protection against unwanted adhesion of rust films and the like, as well as corrosion of the piston rod itself, even when the piston rod extends from the second machine part 14.

[0042] It should be noted that the impulse wiper 20 may include a support section 42 that is axially spaced apart from the wiping edge 26 and (at least temporarily) bears against the mating surface 28. During operation, the support section 42 can bear against the mating surface 28, thereby counteracting tilting moments acting on the impulse wiper 20. The support section 42 is designed here purely by way of example as a spherical annular projection that does not have a sealing effect and may also include one or more axial channels in the circumferential direction. Other geometric designs of the support section are readily conceivable.

[0043] according to Figure 2In the illustrated embodiment, the wiper lip 24 of the impulse wiper 20 can also have multiple material weakenings spaced apart in the axial direction. Each material weakening is preferably designed as an annular groove 34 and has the aforementioned functional advantages. During normal operation of the impulse wiper 20, each material weakening or annular groove 34 of the wiper lip 24 can narrow radially. 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 from or filled with a highly compressible soft material having a lower elastic modulus than the rest of the wiper lip 24. Open-cell elastomeric foam is particularly suitable for this.

[0045] according to Figure 3 In the embodiment shown, 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. In particular, 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 greater 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 spring-elastically and has an exponentially increasing spring characteristic curve in terms of axial deformation, please also refer to the following description of the carrier element 44. Figure 8 Thus, the support element 44 acts as a spring-elastic energy accumulator with an increasing spring characteristic curve. In other words, the axial force F required for the axial deformation of the support element A As the deformation of the support element increases, the force suddenly increases, thereby functionally generating an axial stop for the axial deformation of the support element 44, thereby inducing an axial deflection movement of the wiper lip 24 in the inward direction H, through which a wiper pulse or a separating torque generated by the return movement of the piston rod can be applied to foreign matter adhering to the piston rod.

[0046] If the elastic force of the bearing element 44 exceeds the axial force F when the foreign matter 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 outwardly convex arcuate basic shape and may form an angle γ with the matching surface 28 of the piston rod in the illustrated normal working state, 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 a viscoplastic material for the wiper lip 24. Viewed in cross section, the support element 44 is designed to have an arcuate cross-sectional shape. The wiper lip 24 has a second wiper edge 26, which is offset axially inwardly in the direction H relative to the first wiper edge 26. Both wiper edges 26 are made of the same material. The second wiper edge 26 has an inward main direction of action 30', opposite to the outward main direction of action 30 of the first wiper edge 26.

[0049] It should be noted that the carrier element 44 itself may include an active edge 46 having a wiping function. The active edge 46 preferably does not contact the mating surface 28 during normal operation to avoid damaging the mating surface. In this regard, the active edge is preferably arranged to be spaced only a small distance from the mating surface 28, 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 resist the axial force F that occurs when the impulse wiper is in operation. A Without bending, that is, 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 holding section 22. The holding section 22 can, in particular, comprise an elastomer or be manufactured from an elastomer.

[0051] The wiper lip 24 can have a first and a second wiper edge 26, whose main directions of action 30, 30' can be opposite to each other. This design forms a so-called compound wiper. The wiper lip 24 is made of a rubber-elastically deformable material or a viscoplastically deformable material, and the retaining section is preferably also made of a rubber-elastically deformable material or a viscoplastically 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 the intermediate space 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 this impulse wiper 20, if a 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 with a greater amplitude towards the mating surface 28. When the functional stop effect is achieved, that is, when the force required to deform the holding component suddenly increases, a wiping pulse or 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 is separated from the mating surface 28, the foreign body 19 will be removed. A The supporting 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 carrier element 44 is Figure 4 The illustrated embodiment is designed in a corresponding manner to extend in an arcuate manner and serves as a spring-elastically deformable reinforcement insert for the wiper lip 24. It can be made of metal, viscoplastic hard plastic, or a composite material. The Shore hardness of the material of the support element 44 can, for example, be between 95 Shore A and 70 Shore D. The wiper lip 24 here has three wiper edges 26, which are arranged axially spaced apart and have opposing main directions of action 30, 30'. The material of the wiper lip is preferably softer or more viscoplastically deformable than that of 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. This can further improve the wiping function of the wiping lip 24, in particular for particularly hard foreign bodies or foreign bodies that are particularly firmly attached to the mating surface.

[0056] Figure 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 holding section 22 , by means of which the above-mentioned functional stop 38 is realized or formed.

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 (18) of a machine component (12, 14) and a wiper lip (24) extending away from the holding section (22) in an axial direction relative to a central axis (Z) of the impulse wiper (20), the wiper lip having a wiper edge (26) extending circumferentially relative to the 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). The wiper lip (24) is elastically deformable and has one or more annular grooves (34) on its radially inner circumferential side facing away from the holding section (22), wherein the annular grooves define a predetermined bending zone (36) of the wiper lip (24), wherein an axial stop (38) for an opposite second groove wall (34b) of the annular groove (34) of a longitudinal section (24a, 24b) of the wiper lip (24) is formed by a first groove wall (34a) of the annular groove (34) facing the wiper edge (26), and the longitudinal section is correspondingly arranged at the distal end of the axial stop (38), so that an axial force (F) caused by a foreign body (19) attached to the mating surface (28) and acting on the wiper lip (24) in the axial direction toward the holding section (22) is A ) causes the wiper lip (24) to be deflected preferentially in the region of the predetermined bending zone (36) until the second groove wall (34b) abuts against the first groove wall (34a).

2. The pulse wiper according to claim 1, characterized in that The wiping edge (26) is made of a material with a hardness between 80 Shore A and 70 Shore D.

3. The pulse wiper according to claim 1 or 2, characterized in that The wiper edge (26) is embodied in a corrugated or serrated manner.

4. The pulse wiper according to claim 1 or 2, characterized in that The impulse wiper (20) has a plurality of wiper lips (24) and / or wiper edges (26).

5. The pulse wiper according to claim 4, characterized in that The first and second wiper lips (24) have main directions of action (30, 30') that are opposite to each other.

6. The pulse wiper according to claim 1, wherein The wiper lip (24) has a plurality of annular grooves (34) which are spaced apart from each other in the axial direction.

7. The pulse wiper according to claim 6, characterized in that Each annular groove (34) of the wiper lip (24) narrows in the radial direction.

8. The pulse wiper according to claim 7, characterized in that The annular grooves (34) each have a radial depth (t) which increases with increasing distance from the wiper edge (26).

9. The pulse wiper according to claim 1 or 2, characterized in that: The impulse wiper (20) has a support section (42) 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).

10. The pulse wiper according to claim 1 or 2, characterized in that The one or more annular grooves (34) extend annularly around the periphery.

11. A wiper arrangement (10) comprising a first machine part (12) and a second machine part (14) surrounding the first machine part (12), the machine parts being arranged spaced apart from one another to form a bearing gap (16), wherein one of the two machine parts (12, 14) comprises a retaining structure, in which an impulse wiper (20) as claimed in any one of claims 1 to 10 is arranged in a retaining manner, wherein at least one wiper lip (24) of the impulse wiper (20) rests in dynamic contact on a mating surface (28) of the respective other machine part (12, 14), wherein an axial force (F) acting on the wiper lip (24) is caused by a foreign body (19) adhering 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 axial stop (38) so as to wipe the foreign body (19) off the mating surface.

12. The wiper arrangement (10) according to claim 11, characterized in that The annular groove (34) 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 annular groove (34) radially in the direction of the machine part (12, 14) having the mating surface (28).

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