Telescopic suspension fork leg and telescopic suspension fork equipped with it

Abstract

Telescopic suspension fork leg (1, 43), with an inner tube (2) and an outer tube (3) and a damping device (7) as well as a spring device (5) which is arranged within a first chamber (5) formed in the inner tube (2) or outer tube (3) and is supported against a second chamber (6) formed by the damping device (7), and the telescopic suspension fork leg (1, 43) is designed to receive a damping fluid,wherein the damping device (7) has a piston (9) supported on a piston rod (8) with an upper and a lower piston surface (10; 11), and the piston (9) is displaceable within a damping tube (13) arranged largely concentrically to the inner tube (2), and the damping tube (13) is surrounded by an annular chamber (14) arranged largely concentrically to the damping tube (13), and a gap (15) is formed between the inner tube (2) and the outer tube (3), and a sliding bushing (28) is provided radially surrounding the inner tube (2), and the telescopic suspension fork leg (1, 43) has a sealing device (24) radially surrounding the inner tube (2), which sealing device has at least one sealing means (25) supported on an outer circumferential surface (27) of the inner tube (2), and a receiving chamber (37) is provided for receiving damping fluid,and at least one fluid passage (38) is provided between the receiving chamber (37) and a receiving space (39) provided on the telescopic suspension fork leg, and the fluid passage (38) is designed for the outflow of damping fluid from the receiving chamber (37) into the receiving space (39), characterized in that the at least one fluid passage (38) is designed in the form of a groove (51) extending between the receiving chamber (37) and the gap space (15) as a receiving space (39), which has a configuration extending at an angle to a portion of a longitudinal center axis of the telescopic suspension fork leg (1, 43) and is formed on an inner peripheral surface (31) of the outer tube (3) and / or an outer peripheral surface (46) of the sliding bushing (28).

Description

The present invention relates to a telescopic suspension fork leg according to the preamble of claim 1 and to a telescopic suspension fork according to claim 10 and to a motorcycle having such a telescopic suspension fork according to claim 11.The telescopic suspension fork leg according to the invention can be used, for example, to form a telescopic suspension fork or else, for short, a telescopic fork which is used on a motorcycle. The motorcycle can be a sport utility motorcycle or a motorcycle for use on fixed roads or a racing sport utility motorcycle or the like, as well as a more than one-track vehicle equipped with a telescopic suspension fork, i.e. for example an all-terrain vehicle ATV or quad or a bicycle or the like.Such a telecine performs the function of guiding a front wheel or the front wheels of the vehicle in question, performs the function of suspension and serves for damping when the vehicle moves over unevenness of the road surface, thus ensures that the suspension movement decays again rapidly and also serves to support a braking torque, which is built up as a reaction torque during the braking of the front wheel or the front wheels, relative to the frame of the vehicle.In such a telescopic suspension fork leg, a large focus is regularly placed on the seal between the inner tube and outer tube or the immersion tube and stand tube of the telescopic suspension fork leg, since on the one hand the escape of damping fluid from the interior of the telescopic suspension fork leg must be prevented and on the other hand the penetration of dust and dirt into the interior must also be prevented.For the last mentioned purpose, a sealing device is provided between the outer tube and the inner tube, which is intended to prevent the penetration of dust and dirt, wherein this can be a dirt scraper, which can either be provided as a separate component or can also be formed integrally with the sealing device.On the outer periphery of the inner tube, a fluid film formed by the damping fluid is located in the form of the fork oil provided in the telescopic suspension fork leg, since the inner tube or immersion tube dips into the outer tube or stand tube during the dynamic suspension movement and fork oil is located in the outer tube or stand tube as damping fluid, so that the outer peripheral surface of the inner tube or immersion tube is wetted with fork oil. The fork oil must be prevented from exiting from the interior of the telescopic suspension fork leg and for this purpose a sealing means provided on the sealing device in the form of, for example, a sealing lip rests on the inner tube. The sealing lip has the task of retaining the fluid film via contact with the outer circumferential surface of the inner tube, wherein this is to be understood both in the sense of a static tightness and in the sense of a dynamic tightness during the dynamic operation of the telescopic suspension fork leg.For this purpose, the sealing lip rests with a predetermined prestress against the outer circumferential surface of the inner tube and, during a rebound movement, strips off a large part of the fork oil, but a fluid film always remains on the outer circumferential surface of the inner tube. The sealing lip is statically prestressed by a spiral tension spring surrounding the latter and acting against the outer circumferential surface of the inner tube, and a part of the prestress is contributed by the elastic deformation of the sealing lip by its bearing on the outer circumferential surface of the inner tube.Although the static sealing behavior of the sealing lip can be influenced by increasing the prestressing force of the spiral tension spring, increasing the prestressing also leads to the friction occurring between the sealing lip and the outer circumferential surface of the moving inner tube or immersion tube increasing, as a result of which, on the one hand, the wear behavior of the sealing lip deteriorates and, on the other hand, the response behavior of the telescopic suspension fork leg also deteriorates, since the breakaway torque increases as a result of the increased prestressing. There is thus a conflict of goals between the tightness behavior of the telescopic suspension fork leg and the response behavior of the telescopic suspension fork leg in response to unevenness of the ground on the roadway on which the vehicle equipped with the telescopic suspension fork leg is moved.A telescopic suspension fork leg and a telescopic suspension fork equipped therewith have already become known from DE 10 2011 000 279 A1, which has already proven its worth in practical use, but nevertheless offers room for improvements in order to ensure a constant response behavior to unevenness of the road surface even with a longer dynamic use.With reference to WO 92 / 16 770 A1, a telescopic suspension fork for a motorcycle has become known, which has a known sealing device provided between the inner tube and the outer tube.It is therefore the object of the present invention to provide a telescopic suspension fork leg which addresses this problem and to provide a telescopic suspension fork leg which reliably maintains its response behavior to unevenness in the road surface even during dynamic operation of the telescopic suspension fork leg and also ensures that the tightness behavior of the telescopic suspension fork leg can be improved and the response behavior is improved.Furthermore, a telescopic suspension fork with the telescopic suspension fork leg to be created is also to be provided, and a method for producing such a telescopic suspension fork leg is also to be provided.To achieve this object, the invention has, with respect to the telescopic suspension fork leg, the features specified in claim 1. Advantageous embodiments thereof are described in the further claims.Moreover, with respect to the telescopic suspension fork, the invention has the features specified in claim 16 and a method for producing a telescopic suspension fork leg is specified in claim 18.The invention provides a telescopic suspension fork leg, having an inner tube and an outer tube and a damping device as well as a spring device which is arranged within a first chamber formed in the inner tube or outer tube and is supported with respect to a second chamber formed by the damping device, and the telescopic suspension fork leg is formed for receiving a damping fluid, wherein the damping device has a piston supported on a piston rod and having an upper and a lower piston surface, and the piston is displaceable within a damping tube arranged substantially concentrically with respect to the inner tube, and the damping tube is surrounded by an annular chamber arranged substantially concentrically with respect to the damping tube, and a gap space is formed between the inner tube and the outer tube, and a sliding bushing radially surrounding the inner tube is provided, and the telescopic suspension fork leg has a sealing device radially surrounding the inner tube, which has at least one sealing means supported on an outer circumferential surface of the inner tube and a receiving chamber is provided for receiving damping fluid, and at least one fluid passage is provided between the receiving chamber and a receiving chamber provided on the telescopic spring fork leg, and the fluid passage is formed for draining damping fluid from the receiving chamber into the receiving chamber, wherein the at least one fluid passage is formed in the form of a groove which extends between the receiving chamber and the gap chamber as a receiving chamber and has a configuration which extends at an angle to a portion of a longitudinal central axis of the telescopic spring fork leg and is formed on an inner circumferential surface of the outer tube and / or an outer circumferential surface of the sliding bushing.The inventors of the telescopic suspension fork leg according to the invention have recognized that the prestress with which the sealing lip abuts the outer circumferential surface of the inner tube depends not only on the prestress which is dependent on the inner tube as a result of the elastic deformation of the sealing device and the tensile stress of the helical tension spring acting on the sealing device, but also on the pressure conditions which arise during operation of the telescopic suspension fork leg in the region of the cantilever body which forms the sealing lip and with which the sealing lip is formed on the radial shaft sealing ring provided as a sealing device.During a rebound movement of the telescopic strut, damping fluid is pushed via the annular gap space formed between the sliding bushing and the inner tube into the region behind the boom body, and there is a pressure increase in this region, which acts as a receiving chamber for the damping fluid, and as a result, the dynamic movement of the telescopic strut significantly increases the prestress with which the sealing lip bears against the outer circumferential surface of the inner tube. In the sealing gap between the sealing lip and the outer circumferential surface or surface of the inner tube, the pressure is thus increased.During a compression movement of the telescopic suspension fork leg, damping fluid is carried along via the damping fluid adhering to the inner tube via the cohesive effect occurring in the damping fluid and conveyed as it were out of the receiving chamber, so that a pressure level can be established in the receiving chamber which is lower than the ambient pressure, since the pressure in the sealing gap decreases significantly, so that air can flow from the environment into the telescopic suspension fork leg to be considered as a closed system, that is to say can reach the interior of the telescopic suspension fork leg.Due to the fact that the fork oil adheres to the outer circumferential surface of the tube, the moving tube of the telescopic suspension fork leg leads to the pressure and thus the pressure conditions in the region of the sealing gap substantially changing as a function of the direction of movement of the moving tube compared with the installation-related pressure between the sealing lip and the outer circumferential surface of the tube, via the damping fluid thus dragged along with the movement of the tube, said damping fluid being referred to as the drag pressure. This leads to the unsatisfactory state that the response behavior of the telescopic suspension fork leg to irregularities in the road surface also changes as a result of the change in the internal pressure in the telescopic suspension fork leg which occurs during dynamic operation.In other words, this means that the spring and damping behavior of the telescopic suspension fork leg changes during operation and the internal pressure in the telescopic suspension fork leg system, which increases as a result of the dynamic operation of the telescopic suspension fork leg, must be normalized, for which purpose in a known telescopic suspension fork leg a respective discharge valve is provided, with which the increased internal pressure can be discharged by opening the discharge valve.With the release of the increased internal pressure from the interior of the telescopic suspension fork leg, the problem of the changing response of the telescopic suspension fork leg caused thereby can be alleviated, but no change takes place at the cause of the problem.The telescopic suspension fork leg according to the invention provides a remedy here by providing a fluid passage between the receiving chamber and a receiving chamber provided on the telescopic suspension fork leg.The telescopic suspension fork leg thus equipped according to the invention creates a fluidic connection between the receiving chamber and a receiving space provided on the telescopic suspension fork leg through the fluid passage and thus makes it possible, via the dynamic movement of the telescopic suspension fork leg, for damping fluid which is dragged or dragged or transported into the receiving chamber to flow out of the receiving chamber, specifically in the direction of the receiving space or into the receiving space on the telescopic suspension fork leg and therefore a considerable increase in pressure in the receiving chamber caused by the drag pressure cannot occur and therefore the pressing or surface pressure in the sealing gap between the sealing means of the sealing device and the outer circumferential surface of the moving tube of the telescopic suspension fork leg is no longer subject to the large fluctuations, as is the case with the known telescopic suspension fork leg and this has been described in detail above.Thus, when the moving tube of the telescopic suspension fork leg according to the invention, which can be the immersion tube or inner tube, is moved relative to the standpipe fixed on the vehicle during operation of the vehicle equipped therewith, fork oil is carried along via the adhesion force prevailing between the damping fluid in the form of the fork oil and the contact surface of the fork oil on the moving tube, that is to say the outer circumferential surface or contact surface between the sealing lip and the moving tube, via the gap space between the sliding bushing and the outer circumferential surface and is conveyed into the receiving chamber, that is to say for example a space in the region of or behind the sealing lip.However, the fork oil is not, as is the case in the known telescopic suspension fork leg, there acted upon by an increasing dynamic pressure via the further movement of the immersion tube and the associated further transport of fork oil into the receiving chamber, which would lead to a marked increase in the pressure and between the sealing lip and the outer circumferential surface, but the entrained fork oil can flow off via the fluid passage between the receiving chamber and a receiving chamber provided on the telescopic suspension fork leg, with the result that an increasing dynamic pressure no longer occurs and therefore the working pressure in the receiving chamber and thus the pressure or surface pressure between the sealing lip of the sealing device of the outer circumferential surface of the moving tube remains constant or virtually constant over the entire or substantially entire relative path or inward deflection path of the immersion tube to the standpipe.This in turn leads to the sealing device or the sealing means or the sealing lip being able to be arranged or installed relative to the outer circumferential surface of the moving pipe with such a prestress or compression or surface compression that, on the one hand, a sufficient tightness against the escape of fork oil is achieved in the static state and also in the dynamic state and, on the other hand, the formation of a negative pressure in the receiving chamber can be prevented, so that the problem of the outflow of air from the environment into the interior space of the telescopic fork leg can also be eliminated and this in turn leads to the response behavior of the telescopic reproduction leg and of the telescopic spring fork formed therewith remaining the same even in the dynamic operation, Therefore, the feedback felt by the driver or user of the vehicle equipped with the telescopic suspension forks according to the invention or the telescopic suspension fork according to the invention during driving does not substantially change even after a longer operating time, since the internal pressure in the system or the internal pressure in the interior of the telescopic suspension fork leg according to the invention does not change due to the omission of the inflow of air into the interior.Because the prestress with which the sealing lip abuts the outer circumferential surface of the moving pipe can be minimized in such a way that the telescopic suspension fork leg is fluid-tight against the escape of damping fluid during static and dynamic operation, on the one hand, and the static prestress no longer has to be increased to such an extent that the telescopic suspension fork leg remains still tight even when a negative pressure occurs in the receiving chamber, since such a negative pressure situation is no longer present, since damping fluid can also flow back from the receiving chamber into the receiving chamber via the at least one fluid passage, the sealing lip now abuts the outer circumference with a largely constant prestress, as a result of which the breakaway torque or the breakaway force of the telescopic suspension fork leg or the telescopic suspension fork according to the invention is reduced compared to known telescopic suspension fork legs or telescopic suspension forks.Since a pressure equalization takes place via the at least one fluid passage between the receiving chamber and the receiving chamber provided on the telescopic suspension fork leg, it is now also possible to set the configuration of the sealing lip and the internal pressure prevailing in the interior of the telescopic suspension fork leg in such a way that, during the dynamic movement of the telescopic suspension fork leg according to the invention, an oil film is set on the outer circumferential surface with such a thickness that a dirt scraper provided on the telescopic suspension fork leg no longer has to be dimensioned in such a way that it can retain a maximally thick oil film, but can be dimensioned in such a way that it can retain the now prevailing film thickness of the oil film, whereby in turn the breakaway torque of the telescopic suspension fork according to the invention or of the telescopic suspension fork leg according to the invention is reduced and moreover the entry of dirt into the interior of the telescopic suspension fork leg can be further reduced, since the dirt scraper always rests with the predetermined, suitable prestress on the outer periphery of the telescopic suspension fork leg.In addition, the telescopic suspension fork leg according to the invention has the advantage that, in the case of long dynamic use, the friction torque values measured by means of a test stand structure are substantially more constant than in the case of the known telescopic suspension fork leg, since, as a result of the continuous circulation of damping fluid from the contact region of the sealing lip on the outer circumferential surface of the moving tube and the gap space between the sliding bushing and the moving tube, any dirt particles present and unavoidable in the system are flushed out of the contact region and therefore, on the one hand, the friction behavior remains largely the same even in the case of long operation and, moreover, as a result of the circulation of the damping fluid, it is prevented that damping fluid remaining in the contact region ages prematurely for a longer time. This is because such premature aging would also lead to the detectable friction torque values increasing significantly in a short time. Here too, the invention provides substantial advantages of reducing the increase in the coefficients of friction torque and the further advantage that the damping fluid used ages uniformly and the changeover intervals for the damping fluid can thus be extended.According to a further development of the invention, it is provided that the receiving space is formed by the gap space or one of the first or second chambers. In other words, this means that the fluid passage extends or runs from the receiving chamber as far as the gap space formed between the inner tube and the outer tube or can also run as far as the first chamber or second chamber of the telescopic suspension fork leg, or is in fluid communication with one of the aforementioned spaces or regions.This ensures that the damping fluid accumulating in the receiving chamber, in the form of, for example, the aforementioned fork oil, can flow out via the at least one fluid passage into the gap space or the first chamber or the second chamber, and therefore a significantly changing and / or increasing dynamic pressure is no longer formed in the receiving chamber, and therefore the working pressure in the receiving chamber during the dynamic operation of the telescopic suspension fork leg according to the invention largely corresponds to the pressure which is established in the interior space of the telescopic suspension fork leg. This pressure that is established in the interior space is decisively determined by the compression movement and expansion movement of the telescopic suspension fork leg, since the internal pressure in the telescopic suspension fork leg increases due to the compression movement, since the volume of the telescopic suspension fork leg available for the air volume enclosed in the interior space decreases during the compression movement and thus carries out a pressure increase, while the internal pressure decreases during the expansion movement, since the available volume increases and thus the internal pressure decreases.According to a further development of the invention, it is also provided that the at least one fluid passage is formed on the sliding bushing and / or the outer tube.The configuration on or in the region of the sliding bushing ensures that an already present installation space or an already present component of the telescopic suspension fork leg according to the invention is used to integrate the at least one fluid passage and no additional component has to be installed in the telescopic suspension fork leg for forming the at least one fluid passage. For this purpose, the at least one fluid passage can be arranged, for example, on the outer circumferential surface of the sliding bushing, so that fork oil accumulating in the receiving chamber can flow off via this fluid passage into the gap space formed between the inner tube and the outer tube.It is also possible to provide the at least one fluid passage on the outer tube of the telescopic suspension fork leg according to the invention, namely on the inner circumferential surface of the outer tube, such that the fork oil can flow out of the receiving chamber again, for example, into the gap space formed between the inner space and the outer tube.According to a further development of the invention, it is also provided that a hollow-cylindrical body is provided radially between the sliding bushing and the outer tube, and the body is provided with the at least one fluid passage. This hollow-cylindrical body can therefore be provided concentrically with the sliding bushing or can have, at least in sections, concentrically with the sliding bushing and a fluid passage which connects the receiving chamber to the receiving chamber. This configuration offers the advantage that further functional surfaces of the telescopic suspension fork leg according to the invention can also be integrated into this hollow-cylindrical body.According to a further development of the invention, it is also provided that the at least one fluid passage extends as far as into a region supporting the sealing means relative to the outer circumferential surface of the inner tube. In this way, the fluid passage can also already form a part of the receiving chamber. The sealing means, i.e. for example the sealing lip already mentioned above, can be formed, for example integrally formed, on a cantilever of a shaft sealing ring which is of hollow cylindrical cross-section, such that the region radially outside the cantilever and inside the inner circumferential surface of the outer tube forms the receiving chamber.It is also possible for the shaft sealing ring to have a shaped surface radially outside the cantilever, which is formed by a body formed on the shaft sealing ring and an extension formed in a hollow cylindrical or cup-shaped manner in cross section, and this serves for centering and bearing the shaft sealing ring with its outer circumferential surface on the inner circumferential surface of the outer tube, so that the receiving chamber is formed between the cantilever and this body.According to a further development of the invention, it is also provided that the at least one fluid passage extends as far as into a region supporting the sealing means relative to the outer circumferential surface of the inner tube. The at least one fluid passage thus creates, as it were, an axial extension of the receiving chamber and ensures that a flow path is provided in the direction of the receiving chamber, i.e. for example the gap space between inner tube and outer tube, for the fork oil accumulating in the receiving chamber, which flow path has a low flow resistance and can therefore discharge the damping fluid carried along by the dynamic movement of the telescopic suspension fork leg according to the invention from the receiving chamber without a high flow resistance.According to a further development of the invention, it is also provided that the at least one fluid passage is formed by a groove that connects the receiving chamber and the receiving chamber fluidically or for fluid communication.This groove can have different cross-sectional shapes and can be formed, for example, on its outer circumferential surface during the production of the sliding bushing, but the groove can also be formed, for example, on its inner circumferential surface during the production of the outer tube, namely by machining or without machining.According to a further development of the invention, it is also provided that the at least one fluid passage is arranged on an inner circumferential surface of the outer tube and extends between the gap space and the receiving chamber. The fluid passage can be formed, for example, by means of the groove already mentioned, which is formed on the inner circumferential surface of the outer tube and therefore the groove acts as a fluid channel between the gap space formed between the inner tube and the outer tube and the receiving chamber. Fork oil or damping fluid can flow via the fluid passage in both directions, i.e. in the direction of the receiving chamber and also in the direction of the receiving chamber.According to a further development of the invention, it is also provided that the at least one fluid passage is formed on an outer circumferential surface of the sliding bushing and extends between the gap space and the receiving chamber. The fluid passage can be formed or produced, for example, on the outer circumferential surface of the sliding bushing during its production, and it is also possible for two or more than two fluid passages to be arranged in an equally distributed manner on the outer circumference of the sliding bushing, with the result that flow paths are available to the fork oil accumulating in the receiving chamber, with the result that the fork oil can flow out of the receiving chamber and can also flow into the receiving chamber.According to a further development of the invention, it is also provided in a very general manner that the at least one fluid passage is formed in the form of a groove which extends between the receiving chamber and the receiving chamber and which has a configuration which is at least largely parallel or extends at an angle to a section of a longitudinal central axis of the telescopic suspension fork leg and is formed on an inner circumferential surface of the outer tube and / or an outer circumferential surface of the sliding bushing and / or is formed on a hollow-cylindrical body which is provided radially between the sliding bushing and the outer tube or in the longitudinal extent of the sliding bushing.According to a further development of the invention, it is also provided that the at least one fluid passage is formed in the form of a groove which extends between the receiving chamber and the receiving chamber and is formed on an inner circumferential surface of the outer tube and / or an outer circumferential surface of the sliding bushing in the form of a coil or a duct which is formed in a helical manner extending about a section of a longitudinal central axis of the telescopic suspension fork leg.In other words, the groove is formed in the shape of a coil or a spiral formed on an outer circumferential surface of the slide bush or formed on an inner circumferential surface of the outer tube, such that the fluid passage or fluid channel extends around a portion of a longitudinal central axis of the telescopic suspension fork leg in a helical or spiral manner.According to a further development, the invention also provides that the at least one fluid passage has a cross-sectional area which corresponds at least to the area of an annular gap area which is formed between the inner tube and the sliding bushing.This ensures that the damping fluid is provided with a return flow possibility with low flow resistance. The cross section of the at least one fluid passage or fluid channel can take various forms and it has been shown that the fluid channel should have a cross-sectional area which corresponds at least to the area of the annular gap area which is formed between the outer periphery of the inner tube and the sliding bushing.According to a further development of the invention, it is provided that this cross-sectional area corresponds to a value in the range of one to five times, preferably one to three times, preferably approximately three times, the area of the annular gap area mentioned. The cross-sectional area can be distributed over more than one fluid channel or fluid passage, for example two or three fluid channels or fluid passages can be provided, the total area of which corresponds to approximately three times the value of the area of the annular gap area between the inner tube and the sliding bushing.According to a further development of the invention, it is also provided that the at least one fluid passage in the form of fluid passages is arranged at the same distance from one another in the circumferential direction of the outer circumference of the sliding bushing or of the inner circumference of the outer tube, that is to say the fluid passages are distributed equally in terms of the angle in the circumferential direction.According to a further development of the invention, it is also provided that the at least one fluid passage has a shape similar to a segment of a circle in a cross-sectional view. Such a shape arises when a circle having a surface which is arranged at right angles to the circle intersects the circle. In a cross-sectional view, a shape similar to a segment of a circle is thus obtained. More than one such circular segment-shaped fluid passage can then be arranged, for example, on the inner circumferential surface of the outer tube, so that a region running in the longitudinal direction of the outer tube is present on the inner circumferential surface of the outer tube, which region runs coaxially with the sliding bushing, so that the fluid passages are provided radially outside the sliding bushing.The invention also provides a telescopic suspension fork having two telescopic suspension fork legs, as have been explained above, wherein the telescopic suspension fork legs are arranged in such a way that the damping device is arranged below or above the first chamber accommodating the spring device.The invention therefore also provides a telescopic suspension fork which has two telescopic suspension fork legs, in which the suspension device acting as a main spring can be arranged at the top or at the bottom when in the installed position on the vehicle, that is to say for example on the motorcycle, as viewed in the vertical axis direction of the vehicle. The suspension device can thus be arranged closer in the direction of the road surface of a vehicle traveling thereon or also at a distance therefrom in the region of fork bridges which are provided on the telescopic suspension fork provided according to the invention or the vehicle provided therewith.The invention also provides a motorcycle having a front wheel and a rear wheel and a seat and a drive motor, the motorcycle having a telescopic suspension fork as described above.The motorcycle can be, for example, a racing sport motorcycle, which is thus used for road racing. In such a racing sport motorcycle, the telescopic suspension fork according to the invention with the telescopic suspension fork legs equipped according to the invention ensures that when driving over unevenness in the road surface on the race track, which occur in the form of washboard-like elevations and depressions, the response behavior of the telescopic suspension fork felt by the driver of the motorcycle does not change during the entire driving over of the plurality of elevations and depressions, that is to say the response behavior in the last pair of elevations and depressions still corresponds to the response behavior of the telescopic suspension fork at the first pair of elevations and depressions. This constant behavior also ensures that the wheel guiding force does not change when driving over the unevenness of the road surface and that higher cornering speeds are thus possible in regions of curves provided with unevenness of the road surface.Because the radial prestress of the shaft sealing rings on the two telescopic suspension fork legs can also be optimized or reduced, i.e. no longer has to be matched to a worst case scenario which takes account of overpressure situations and underpressure situations in the region of the sealing lips, the prestress of the shaft sealing rings can be reduced overall and in this way the response behavior of the telescopic suspension fork can be improved, since a lower prestress of the shaft sealing rings also leads to the breakaway torque of the telescopic suspension fork according to the invention being able to be reduced compared with known telescopic suspension forks and the telescopic suspension fork according to the invention therefore responding more sensitively to irregularities in the ground.Finally, the invention also provides a method for producing a telescopic suspension fork leg having the features as described above, wherein the at least one fluid passage is formed on an inner circumferential surface along a longitudinal direction of the outer tube, wherein, according to the method according to the invention, firstly a tubular body provided for forming the outer tube is provided and then a mandrel tool which supports the tubular body on the inside and has at least one protruding outer contour is introduced into the tubular body up to a region close to the at least one fluid passage to be formed, and then the tubular body and the mandrel tool are moved relative to one another in such a way that the protruding outer contour forms the at least one fluid passage on an inner circumferential surface of the tubular body by means of a chipless forming process.The stand pipe or outer pipe has the largest outer diameter in the region of the sealing device and the above-mentioned mandrel tool can be used in this way to not only expand the diameter on the pipe material for forming the outer pipe and receiving the sealing device, but it can also be used with the mandrel tool in this way to simultaneously introduce the at least one fluid passage in the axial longitudinal direction of the outer pipe in one working step together with the expansion of the diameter of the pipe material, namely for example at the point at which the sliding bushing is introduced for guiding the inner pipe relative to the outer pipe.The at least one fluid channel or fluid passage is then seated radially outside the sliding bushing, such that the at least one fluid channel or fluid passage, as viewed from the outer tube, lies between the sliding bushing and the inner circumference of the outer tube.The invention is explained in more detail below with reference to the drawings. This is shown in: FIG. 1 is a longitudinal sectional view of a telescopic suspension fork leg according to a first embodiment of the present invention; FIG. 2 shows an enlarged illustration of a detail II according to FIG. 1 ; FIG. 3 is a diagram of a telescopic suspension fork leg according to a second embodiment of the present invention; FIG. 4 is a sectional view of an outer tube of the telescopic suspension fork leg according to the first or second embodiment; FIG. 5 is a perspective view of a detail of the outer tube according to FIG. 4 of the drawing for explaining the position of the fluid passage; FIG. 6 is a perspective view of a detail of an outer tube according to a modified embodiment of the fluid passage; FIG. 7 is a perspective view of a slide bushing having a plurality of fluid passages disposed thereon; FIG. 8 shows a detail of a telescopic suspension fork leg according to the present invention for explaining pressure measurement points; FIG. 9 shows a diagram of the pressure profile at the pressure measurement points, recorded on a known telescopic suspension fork leg; FIG. 10 shows a diagram of the pressure profile at the pressure measurement points, recorded on the telescopic suspension fork leg according to the invention; FIG. 11 is a perspective view of a motorcycle with a telescopic suspension fork according to the invention with two telescopic suspension fork legs; and FIG. 12 shows perspective schematic representations of a tubular body for forming the outer tube and of a tool for forming the tubular body without machining and inserting fluid passages without machining.FIG. 1 of the drawing shows a telescopic suspension fork leg 1 with an inner tube 2 and an outer tube 3 and a spring device 4, which is arranged in a first chamber 5 in the embodiment of the telescopic suspension fork leg 1 shown in FIG. 1 of the drawing. The spring device 4 is supported here with respect to a damping device 7 formed by a second chamber 6, and the telescopic suspension fork leg 1 is designed to receive a damping fluid, not shown in more detail, in the form of a fork oil.The damping device 7 generally has a piston rod 8, on which a piston or working piston 9 is supported, which has an upper or first piston surface 10 and a lower or second piston surface 11, and the piston 9 can be displaced within a damping tube 13 arranged largely concentrically with respect to the inner tube 2.The damping tube 13 is surrounded by an annular chamber 14 which is arranged substantially concentrically with respect to the damping tube 13 and forms the region between the outer circumferential surface of the damping tube 13 and the inner circumferential surface of the outer tube 3.As can be seen in more detail with reference to FIG. 2 of the drawing, a gap space 15 is provided between the inner tube 2 and the outer tube 3, in which gap space fork oil is located during the intended operation of the telescopic suspension fork leg 1, which acts as a hydraulic damping fluid.At the lower end of the telescopic suspension fork leg 1 there is formed a clamping thumb 16 on which the front wheel 19 of the motorcycle 18 can be rotatably fixed via the plug-in axle 17 of the motorcycle 18 shown in FIG. 11 of the drawing.The spring device 4 is supported in the region of the clamping thumb 16 on a cover 20 and in the region of the opposite end on a cover 21 of a sliding sleeve 22, which can be displaced along the damping tube 13 and serves for fixing and axially guiding the main spring 4.Since the interior 23 of the telescopic suspension fork leg 1 is filled with fork oil and the latter has to be prevented from exiting from the telescopic suspension fork leg 1, a sealing device 24 is provided, which radially surrounds the inner tube 2 and has a sealing means 25 in the form of a sealing lip 26 which abuts against the outer circumferential surface 27 of the inner tube 2 and is provided to retain the fork oil from exiting during the relative movement of the inner tube 2 relative to the outer tube 3 in the direction of the double arrow P shown in FIG. 2 of the drawing.For axial guidance and for supporting the inner tube 2 on the outer tube 3, a sliding bushing 28 is provided radially to the outer tube 2 and concentrically thereto, which sliding bushing can be provided on the radial inner circumferential surface with a coating in the form of, for example, a polytetrafluoroethylene coating, which on the one hand reduces the friction during the relative movement of the inner tube 2 on the sliding bushing 28 and on the other hand also acts in a wear-reducing manner.The sealing device 24, which in the embodiment shown is embodied in the form of a radial shaft sealing ring 29, has a support body embodied as a cylindrical body 30, which is provided for support on the inner circumferential surface 31 of the outer tube 3 and on the end-face end region of which an elongate extension arm 33 is formed, on the end region 34 of which the sealing lip 26 is embodied, which is distal from the end region 32. The sealing lip 26 is biased against the outer circumferential surface 36 of the inner tube 2 by a helical tension spring 35 which engages on the outside at the end region 34.This configuration results in that, during the rebound movement of the telescopic suspension fork leg 1 in the direction of the arrow A according to FIG. 2, the damping fluid adhering to the outer circumferential surface 36 of the inner tube 2 by the adhesion effect is retained by the sealing lip 26 and the fork oil thus scraped off collects in a receiving chamber 37 which is provided between the sealing device 24 and the sliding bushing 28 or, more generally, in the region of the sealing device 24.As a result of the further rebound movement of the telescopic suspension fork leg 1 with the movement of the inner tube 2 in the direction of the arrow A according to FIG. 2, more oil accumulates in the receiving chamber 37 and this leads to a dynamic pressure building up in the receiving chamber 37.In a known telescopic suspension fork leg this accumulation of fork oil in the receiving chamber leads to pressure conditions which can be seen in more detail with reference to FIG. 9 and which can be established as can be established with a measuring construction explained below with reference to FIG. 8 of the drawing.The measuring structure according to FIG. 8 shows a section according to the area VIII from FIG. 2 of the drawing. With the measuring structure shown in FIG. 8, the pressure diagram according to FIG. 10 of the drawing was also determined, which shows the pressure conditions in a telescopic suspension fork leg 1 according to the invention, while FIG. 9, used for comparison, shows the pressure conditions in the known telescopic suspension fork leg.FIG. 8 shows the inner tube 2 and the outer tube 3 as well as the sealing device 24 with the receiving chamber 37 and the gap space 15 between the inner tube 2 and the outer tube 3; FIG. 8 also shows a bore 12 provided on the inner tube 2, via which fork oil, which flows via the bypass channel 38 into the gap space 15, can easily flow into the interior space of the telescopic suspension fork leg 1. It is also possible to provide a plurality of bores 12 on the periphery of the inner tube 2, so that the flow resistance for the fork oil flowing into the gap space 15 is further reduced.The configuration of the telescopic suspension fork leg 1 according to the invention illustrated in FIG. 8 is now characterized in that the telescopic suspension fork leg 1 has a fluid passage 38 or fluid channel or bypass channel between the receiving chamber 37 and the gap space 15, which ensures that the fork oil accumulating in the receiving chamber 37 can flow via the fluid passage 38 into the receiving space 39 which is configured as gap space 15 in the embodiment illustrated and it is thus possible to prevent the formation of a dynamic pressure in the receiving chamber 37, which is still established during the configuration of the known telescopic suspension fork leg.FIG. 9 of the drawing shows the pressure conditions in the receiving chamber and the gap space in a known telescopic suspension fork leg, which differs from the configuration according to FIG. 8 of the drawing in that the known telescopic suspension fork leg does not have the fluid passage or fluid channel or bypass channel 38.In order to determine the diagrams showing pressure conditions shown in FIGS. 9 and 10 of the drawing, the pressure in the chamber A and the chamber B, which is set as a result of a dynamic spring movement of the telescopic suspension fork leg, is measured.FIG. 9 shows the pressure conditions which result in the illustrated measuring structure on the known telescopic suspension fork leg, while FIG. 10 shows the pressure conditions which result in the illustrated measuring structure on the telescopic suspension fork leg 1 according to the invention.To determine the pressure conditions, both the known telescopic suspension fork leg and the telescopic suspension fork leg according to the invention were subjected to a test run which is distinguished by a sinusoidal suspension movement which is shown in the diagram according to FIG. 9 and in the diagram according to FIG. 10 in each case with a sinusoidal oscillation 40 which led to the pressure conditions which were likewise shown.The curve trace 41 according to FIG. 9 shows the pressure build-up at the measuring point of the chamber B according to FIG. 8, while the curve trace 42 shows the pressure build-up at the measuring point of the chamber A according to FIG. 8.As can be seen from FIG. 9 of the drawing, the pressure build-up in the chamber B follows the internal pressure in the gap space 15 or the interior space of the telescopic suspension fork leg corresponding to the compression position, since the air volume enclosed in the telescopic suspension fork leg is compressed by the compression movement and the internal pressure in the interior space 23 of the telescopic suspension fork leg thus periodically changes with the periodically oscillating compression position.The curve 42 which shows the pressure profile at the measuring point of the chamber A according to FIG. 8, i.e. the internal pressure established in the chamber A, initially drops significantly with the increasing compression position of the known telescopic suspension fork leg, it even drops below the ambient pressure of the pressure level of 0 bar referenced in FIGS. 9 and 10, which means that a negative pressure is established at the measuring point of the chamber A, which leads to air being able to flow into the interior 23 of the known telescopic suspension fork leg from the environment, which air is then enclosed in the interior and leads to the above-described problem of pumping up the known telescopic suspension fork leg.After the maximum compression position designated by the inflection point X is reached and the telescopic suspension fork leg is subjected to a rebound movement, fork oil is dragged along into the chamber A by the inner tube wetted with fork oil on the outer circumference and there occurs the problem described at the beginning of the formation of a dynamic pressure, as a result of which the cantilever is acted upon by the dynamic pressure and this has the result that the sealing lip of the known telescopic suspension fork leg is pressed with high prestress against the outer circumferential surface of the inner tube of the known telescopic suspension fork leg and therefore the friction at the point of contact between the sealing lip and the outer tube of the known telescopic suspension fork leg increases considerably.The pressure curve of the curve 42 shows that, with a falling internal pressure 41, the pressure in the chamber A rises abruptly and therefore the sealing device with the sealing lip resting against the outer circumference of the inner tube must establish a substantially greater pressure range than is predefined by the internal pressure prevailing in the telescopic suspension fork leg. Since a negative pressure is even set in the chamber A during the inward movement of the known telescopic strut, this leads to the sealing lip losing its contact with the outer circumference of the inner tube of the known telescopic strut and leaks thus occurring. This can only be compensated for by the helical tension spring acting upon the sealing lip of the known telescopic suspension fork leg with a high prestress against the outer circumferential surface of the inner tube, as a result of which a high surface pressure is established in the region of the sealing lip and the outer tube, which in turn leads to a high friction moment at the contact point and thus to a poor response behavior of the known telescopic suspension fork leg.Since the spring movement is constantly repeated during the driving operation of a vehicle equipped with the known telescopic suspension fork leg, the internal pressure rises significantly due to the effect of pumping up the interior space of the known telescopic suspension fork leg and has to be relaxed by actuating a valve provided on the known telescopic suspension fork leg. The response behavior of the known telescopic suspension fork leg is therefore not constant, but rather is subject to great fluctuations which can be detected by the driver of the vehicle equipped therewith during travel.If, for example, a passage of a washboard-like road profile occurs during the travel of the vehicle equipped with the known telescopic suspension fork leg, the large number of suspension movements occurring in a short time leads to the response behavior of the known telescopic suspension fork leg drastically changing in a short time, which is perceived by the driver of the vehicle as a deterioration in the response behavior, since this deterioration also builds up in particular at different time intervals, depending on how many suspension movements the known telescopic suspension fork leg experiences during the travel.FIG. 10 of the drawing shows, in direct comparison with FIG. 9 of the drawing, the substantial improvement achieved with the telescopic suspension fork leg 1 according to the invention.The cam train 40 again shows the sinusoidally extending compression position and the two cam trains 41 and 42 which still deviate considerably in the course of one another in FIG. 9 coincide in FIG. 10. The pressure profile in the chamber A of the telescopic suspension fork leg 1 according to the invention now follows the pressure profile in the chamber B of the telescopic suspension fork leg 1 according to the invention, since fork oil dragged along by the expansion movement into the receiving chamber 37 (chamber A) can flow via the bypass duct 38 into the receiving space 15, which is formed, for example, by the gap space 15 (chamber B) between the outer tube 3 and the inner tube 2.The curves in FIG. 10 show that, during a compression movement of the telescopic suspension fork leg 1 according to the invention, i.e. with an increasing compression position, the pressure in the chamber A (receiving chamber 37) rises in the same way, i.e. with a speed and amplitude corresponding to one another, as the pressure in the chamber B (gap space 15) rises and during a compression movement falls again just as the pressure in the chamber B falls again, i.e. the pressures established in the chamber A and chamber B largely correspond to one another or are largely the same. This therefore also makes it possible to easily ascertain whether a telescopic suspension fork leg to be examined corresponds to a known telescopic suspension fork leg or corresponds to the telescopic suspension fork leg according to the invention.Because the telescopic suspension fork leg according to the invention no longer suffers from the fact that a negative pressure is set in the receiving chamber corresponding to the chamber A, the prestress to be applied by the spiral tension spring 35 can also be reduced without adversely affecting the tightness, the phenomenon of inflation of the telescopic suspension fork leg described above is eliminated, the telescopic suspension fork leg according to the invention and a telescopic suspension fork formed therewith are distinguished by a response behavior of the telescopic suspension fork according to the invention that remains the same even in dynamic operation, and also short suspension movements of the telescopic suspension fork according to the invention, which are brought about by a road surface formed like a washboard, ensure that the response behavior of the telescopic suspension fork when passing over the last excitation does not differ from the response behavior when passing over the first excitation.A user or driver of a vehicle, which has a telescopic suspension fork with the telescopic suspension fork leg according to the invention, for example, also experiences no change in the response behavior of the telescopic suspension fork during a racing event with the vehicle and therefore no longer has to adjust to the fact that the telescopic suspension fork exhibits a different response behavior at the beginning of a racing, for example, than is the case in the final phase of the racing. This also makes it possible, for example, for the speed of the vehicle to increase when driving through curves provided with unevenness in the road surface, since the telescopic suspension fork always exhibits a constant response behavior, that is to say suspension and damping behavior, and does not exhibit a hardening response behavior even with an increasing travel duration.FIG. 3 of the drawing shows a longitudinal sectional representation of a telescopic suspension fork leg 43 according to the invention according to a modified embodiment according to the present invention. As is readily apparent, the telescopic suspension fork leg shown in FIG. 3 differs from the telescopic suspension fork leg 1 according to FIG. 1 in that the telescopic suspension fork leg 43 has a spring device 4 which is arranged at the opposite end region of the telescopic suspension fork leg 43 instead of in the region adjacent to the clamping flap 16, that is to say is arranged at the top in the vertical axis direction H, which is also apparent in FIG. 11 of the drawing, instead of the arrangement at the bottom according to FIG. 1 of the drawing.The telescopic suspension fork leg 43 shown in FIG. 2 of the drawing again shows a cutout II which corresponds to the configuration according to the illustration according to FIG. 2 of the drawing, since the second embodiment of the telescopic suspension fork leg shown in FIG. 3 of the drawing also has a fluid passage 38 between the receiving chamber 37 and the receiving space 39 provided on the telescopic suspension fork leg 43, which again corresponds to the gap space 15 between the inner tube 2 and outer tube 3. The second embodiment of the telescopic suspension fork leg 43 illustrated in FIG. 3 of the drawing therefore has the same advantages which have already been explained above with reference to the telescopic suspension fork leg 1 illustrated in FIG. 1.FIG. 4 of the drawing shows a sectional representation of the outer tube 3 according to the section IV-IV according to FIG. 2 of the drawing, wherein the sliding bushing 28 shown in FIG. 2 of the drawing and the complete inner structure of the telescopic suspension fork leg 1 have been omitted for the sake of simpler representation.The outer tube 3 has an inner circumferential surface 31 on which the sliding bushing 28, which can be a hollow cylindrical body and is illustrated in FIG. 2 of the drawing, can be arranged. The outer tube 3 has three fluid passages 38 which are arranged in an equidistantly distributed manner and each have an angular spacing of 120 degrees from one another and are of circular segment-shaped design and have a total cross-sectional area which, in the embodiment shown, is three times the cross-sectional area of the annular gap between the sliding bush and the outer circumferential surface of the inner tube 2. This embodiment ensures that a bypass channel or flow channel is provided to the fork oil accumulating in the receiving chamber 37 so that it can flow without great flow resistance into the gap space 15 between the outer tube 3 and the inner tube 2 and thus the pressure distribution already described above and illustrated in FIG. 10 of the drawing is established. In the variant shown, the fluid passage is in the form of a groove 51 which is in the form of a segment of a circle. Compared to a configuration which is rectangular in cross section, for example, this shape has the advantage of the lower notch effect and the associated lower influence on the strength of the outer tube 3.FIG. 5 of the drawing shows a perspective illustration of the outer tube 3 of the telescopic suspension fork leg 1, 43 according to the invention with a fluid channel 38 illustrated on a contact surface 45 for receiving the sliding bushing 28.FIG. 6 of the drawing shows a modified embodiment of an outer tube 3, in which the fluid channel 38, via which the fork oil or damping fluid collected in the receiving chamber 37 can flow into the gap space 15 between the outer tube 3 and the inner tube 2, is designed in a spiral or helical manner and extends along a partial longitudinal extension of the outer tube 3. This fluid channel 38 also, which is formed in a spiral shape in the form of a coil or spiral 52, ensures that no dynamic pressure is formed in the receiving chamber 37 and the pressure conditions shown with reference to FIG. 10 of the drawing are established.FIG. 7 of the drawing shows a perspective illustration of a sliding bushing 28 with fluid channels 38 formed on its outer circumferential surface 46 and arranged at an angle to the longitudinal axis of the sliding bushing 28, which is formed by a hollow cylindrical body.Via these fluid channels 38, the fork oil accumulating in the receiving chamber 37 can flow off in the direction of the gap space 15 between the inner tube 2 and the outer tube 3, so that the pressure conditions shown in FIG. 10 of the drawing and already explained above are established again.The motorcycle 18 mentioned above is shown in Fig. 11 of the drawing. The motorcycle 18 has a telescopic suspension fork 47 which has two telescopic suspension fork legs 1 according to FIG. 1 of the drawing. The motorcycle 18 is a sport utility motorcycle which can be used for Motocrosswettbewerbe for example and which therefore has a telescopic suspension fork which is subject to very high dynamic suspension movements. The motorcycle 18 has a front wheel 19 and a rear wheel 48 and a seat 49 and a drive motor 50, which in the embodiment of the motorcycle 18 shown is a four-stroke engine.In such a sport utility motorcycle as well, it is advantageous if the response behavior of the telescopic suspension fork 47 does not change during a competitive travel, since this then also ensures that the driver of the motorcycle does not have to change his driving style.FIG. 12 of the drawing shows three schematic perspective representations for explaining the method for producing the outer tube 3 of the telescopic suspension fork leg 1, 43 according to the invention by means of a non-cutting shaping process or a non-cutting shaping with simultaneous formation of the fluid passages or bypass channels or fluid channels already explained above.As can be readily seen from the drawing and in particular the upper illustration of FIG. 12, firstly a tubular body 53 and a tool 54 in the form of an inner mandrel 55 are provided, which has stepped forming surfaces 56 on its outer periphery for forming the diameter graduations 57 of the outer tube 3 to be produced.As can also be seen with reference to FIG. 12, the inner mandrel 55 has projections 60 which are arranged on its central forming surface 59 in the longitudinal axis direction and are distributed at an angle equally in the circumferential direction and of which, on account of the selected perspective, only one projection 60 is visible in FIG. 12, with which projections the three fluid passages 38 illustrated in FIG. 4 of the drawing can be formed without machining.For this purpose, first the tubular body 53 to be formed into the outer tube 3 and the tool 54 are provided, as can be seen from the upper illustration of FIG. 12, and then the tool 54 is introduced into the end-face opening 61 of the tubular body 53, as can be seen from the middle illustration of FIG. 12. Both the diameter graduations 57 on the tubular body 53 and the groove-shaped fluid passages 38 on the middle diameter graduation 62 are produced without machining, of which again only one fluid passage 38 is visible on the basis of the perspective selected in the lower illustration of FIG. 12.The production method according to the invention is characterized in that the outer tube 3 can be formed without machining and at the same time the fluid passages 38 can be formed.The telescopic suspension fork leg according to the invention and the telescopic suspension fork equipped therewith are distinguished by the advantages that, on the one hand, the problem of the pumping-up of the telescopic suspension fork or of the telescopic suspension fork leg is eliminated and the response behavior of the telescopic suspension fork does not change even in the case of highly dynamic movements during the travel of the vehicle equipped therewith. In addition, it has been found that the continuous increase in friction of the telescopic suspension fork according to the invention is significantly lower during long operation compared to the known telescopic suspension fork, since a substantially improved oil circulation occurs in the region of the sealing lip and the sliding bushing and therefore any dirt particles do not remain in these contact zones between the sealing lip and the inner tube and the sliding bushing and the inner tube, but are rinsed out continuously.The continuous circulation of the fork oil also ensures that the shear stresses occurring in the contact region and loading the fork oil are reduced and therefore the aging process of the used fork oil also slows down, which in turn can be used to increase the changeover intervals for the fork oil. The reduced shear stress also ensures that the liquid friction occurring in the shear gap is reduced and thus the friction torque behavior of the telescopic suspension fork leg according to the invention and of the telescopic suspension fork equipped therewith is reduced overall compared to the known telescopic suspension fork leg and the telescopic suspension fork provided therewith, which in turn ensures that the telescopic suspension fork according to the invention responds more sensitively to irregularities in the road surface than the known telescopic suspension fork.With regard to features of the invention which are not explained in detail above, reference is expressly made to the patent claims and the drawing.List of reference characters1 Telescopic suspension fork leg 2 Inner tube 3 Outer tube 4 Spring device 5 First chamber 6 Second chamber 7 Damping device 8 Piston rod 9 Piston 10 Upper piston surface 11 Lower piston surface 12 Bore 13 Damping tube 14 Annular chamber 15 Gap space 16 Clamping thumb 17 Plug axis 18 Motorcycle 19 Front wheel 20 Cover 21 Cover 22 Sliding sleeve 23 Inner space 24 Sealing device 25 Sealing means 26 Sealing lip 27 Outer circumferential surface 28 Sliding bushing 29 Radial shaft sealing ring 30 Body 31 Inner circumferential surface 32 End region 33 Cantilever 34 End region 35 Helical tension spring 36 Outer circumferential surface 37 Receiving chamber 38 Fluid passage 39 Receiving space 40 Sinusoidal oscillation 41 Curve 42 Curve trace 43 Telescopic suspension fork leg 44 Annular gap 45 Contact surface 46 Outer circumferential surface 47 Telescopic suspension fork 48 Rear wheel 49 Driver's saddle 50 Drive motor 51 Groove 52 coil, spiral 53 tubular body 54 tool 55 inner mandrel 56 forming surface 57 diameter graduations 58 diameter graduations 59 forming surface 60 protrusion 61 opening 62 mean diameter graduations P double arrow A rebound movement H vertical axis direction

Claims

Telescopic suspension fork leg (1, 43), having an inner tube (2) and an outer tube (3) and a damping device (7) and a spring device (5), which is arranged within a first chamber (5) formed in the inner tube (2) or outer tube (3) and is supported with respect to a second chamber (6) formed by the damping device (7), and the telescopic suspension fork leg (1, 43) is formed to accommodate a damping fluid, wherein the damping device (7) comprises a piston (9) supported on a piston rod (8) and having an upper and a lower piston surface (10; 11) and the piston (9) is displaceable within a damping tube (13) arranged substantially concentrically with the inner tube (2), and the damping tube (13) is surrounded by an annular chamber (14) arranged substantially concentrically with the damping tube (13), and a gap chamber (15) is formed between the inner tube (2) and the outer tube (3), and a sliding bushing (28) radially surrounding the inner tube (2) is provided, and the telescopic spring fork leg (1, 43) has a sealing device (24) radially surrounding the inner tube (2), which sealing device has at least one sealing means (25) supported on an outer circumferential surface (27) of the inner tube (2) and a receiving chamber (37) is provided for receiving damping fluid, and at least one fluid passage (38) is provided between the receiving chamber (37) and a receiving chamber (39) provided on the telescopic spring fork leg, and the fluid passage (38) for the outflow of damping fluid from the receiving chamber (37) into the receiving chamber (39), characterized in that the at least one fluid passage (38) is formed in the form of a groove (51) extending between the receiving chamber (37) and the gap chamber (15) as receiving chamber (39), which groove has a configuration extending at an angle to a section of a longitudinal central axis of the telescopic spring fork leg (1, 43) and is formed on an inner circumferential surface (31) of the outer tube (3) and / or an outer circumferential surface (46) of the sliding bushing (28).Telescopic suspension fork leg (1, 43) according to one of the preceding claims, characterized in that the at least one fluid passage (38) extends as far as a region supporting the sealing means (25) relative to the outer circumferential surface (27) of the inner tube (2).Telescopic suspension fork leg (1, 43) according to one of the preceding claims, characterized in that the at least one fluid passage (38) is formed by the groove (51) which fluidically connects the receiving chamber (37) and the receiving chamber (39).Telescopic suspension fork leg (1, 43) according to one of the preceding claims, characterized in that the at least one fluid passage (38) is formed in the form of the groove which extends between the receiving chamber (37) and the receiving chamber (39) and is formed on the inner circumferential surface (31) of the outer tube (3) and / or the outer circumferential surface (27) of the sliding bushing (28) in the form of a coil (52) which extends helically about a section of a longitudinal central axis of the telescopic suspension fork leg.Telescopic suspension fork leg (1, 43) according to one of the preceding claims, characterized in that the at least one fluid passage (38) has a cross-sectional area which corresponds at least to the area of an annular gap area which is formed between inner tube (2) and sliding bush (28).Telescopic suspension fork leg (1, 43) according to claim 5, characterised in that the cross-sectional area corresponds to a value in the range of one to five times, preferably one to three times, preferably approximately three times, the area of the annular gap area.Telescopic suspension fork leg (1, 43) according to one of the preceding claims, characterized byat least two fluid passages (38) arranged in the circumferential direction of the outer circumferential surface of the sliding bushing (28) and / or of the inner circumferential surface of the outer tube (3).Telescopic suspension fork leg (1, 43) according to claim 7, characterised in that the fluid passages (38) are provided evenly distributed in the circumferential direction.Telescopic suspension fork leg (1, 43) according to one of the preceding claims, characterized in that the at least one fluid passage (38) has a shape similar to a segment of a circle in a cross-sectional view.Telescopic suspension fork (47) having two telescopic suspension fork legs (1, 43) according to one of the preceding claims, wherein the telescopic suspension fork legs (1, 43) are arranged in such a way that the damping device (7) is arranged in each case below or above the first chamber (5) accommodating the spring device (4).Motorcycle (48) having a front wheel (19) and a rear wheel (48) and a driver's seat (49) and a drive motor (50), characterized bya telescopic suspension fork (47) according to Claim 10.

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