VIBRATION UNIT AND USE THEREOF IN A VIBRATION ERGOMETER FOR THE LOWER AND UPPER EXTREMITIES

Abstract

The invention relates to a bicycle ergometer, composing at least one pedaling device for a user and a vibration unit, wherein: the vibration unit has at least ore main shaft (12), which is driven directly or indirectly by a motor (54) and has an eccentric disk (6) fastened thereto; the eccentric disk (6) is rotatably coupled to a connecting rod (1); and the connecting rod (1) transmits, by means of a rod eye (1a) disposed on opposite from the eccentric disk (6), the vibrations to the bearing (29) of the pedaling device such that the vibrations are applied substantially exclusively to this bearing (29) in the vertical direction.

Claims

1. Ergometer having at least one pedal device for a user, and having a vibration unit, wherein the vibration unit has at least one main shaft which is driven directly or indirectly by a motor and which has an eccentric disk fastened thereto, wherein the eccentric disk is rotatably coupled to a con rod, and wherein the con rod by way of a con rod head disposed opposite one of the eccentric disk thereof transmits the vibrations to the bearing of the pedal device such that the vibrations bear on this bearing substantially exclusively in the vertical direction.

2. Ergometer as claimed in claim 1, wherein the vibration unit is disposed below the bearing, and wherein the con rod head is coupled directly to the bearing, and wherein the con rod solely and without any further guide supports substantially the entire load directed vertically downward on the bearing.

3. Ergometer as claimed in claim 1, wherein the bearing of the pedal device is mounted in a vertical linear guide having a linear slide, wherein the linear slide at the top is fixedly connected to the bearing, and at the bottom is connected to the con rod head.

4. Ergometer as claimed in claim 2, wherein a floor plate is disposed, the main shaft being disposed therebelow and the pedal device being disposed thereabove, wherein provided in the floor plate is a recess through which the con rod passes and by way of which the con rod head thereof is coupled directly to the bearing.

5. Ergometer as claimed in claim 1, wherein a brake is disposed, which brake by way of a force transmission element is coupled to the pedal device, and wherein the bearing of the pedal device is mounted so as to be pivotable about a horizontal swivel axle.

6. Ergometer as claimed in claim 5, wherein the swivel axle mounting of the bearing is defined by a substantially fork-shaped construction in which the fork ends of the arms are mounted so as to be rotatable about the swivel axle, and the opposite converged arms are connected to the bearing.

7. Ergometer as claimed in claim 5, wherein the vibration unit is disposed below this brake.

8. Ergometer as claimed in claim 1, wherein the ergometer is mounted on a base plate which acts as a mechanical high-pass filter for the vibrations generated by the vibration unit, and/or in that a further eccentric disk by way of which a counterweight is set in a compensating vibration is disposed on the main shaft.

9. Ergometer as claimed in claim 8, wherein the further eccentric disk drives a further con rod which is rotatably mounted on the further eccentric disk and is coupled to a counterweight which is set in vibration substantially in the same direction as the vibration device on the bearing but with an action compensating the vibration on the bearing.

10. Ergometer as claimed in claim 8, wherein a brake is disposed, which brake by way of a force transmission element is coupled to the pedal device, and the counterweight is mounted so as to be pivotable about a horizontal swivel axle mounting.

11. Ergometer as claimed in claim 1, wherein the eccentric disk and/or an optionally present further eccentric disk are/is mounted on the main shaft so as to be displaceable and adjustable along a direction perpendicular to the rotation axis of the main shaft.

12. Ergometer as claimed in claim 11, wherein the at least one adjustment element is mounted in a recess or through-opening in the main shaft so as to be adjustably displaceable by way of actuating means, and a gate in or on the adjustment element adjusts the eccentricity of the eccentric disk by interacting with a sliding block on the eccentric disk.

13. Ergometer as claimed in claim 11, wherein an eccentric disk for generating the desired vibration, and a further eccentric disk for the counterweight, are mounted on the main shaft, and in wherein either an adjustment element by way of which the eccentricity of both eccentric disks can be adjusted in a correlated manner so as to be offset by 180? is provided, or wherein two individual adjustment elements by way of which the eccentricity of the disks can be individually adjusted are provided for the respective eccentric disk.

14. Ergometer as claimed in claim 1, wherein said ergometer is conceived for the operation at a frequency of 1-50 Hz with a vibration amplitude at the bearing in the range from 1-10 mm, or in the range from 3-7 mm, or at a load in the range from 50-500 W, or in the range from 100-300 W.

15. Method of using an ergometer as claimed in claim 1 for therapeutic and/or form-building therapy, wherein frequencies at the bearing are adjusted in the range from 5-50 Hz, or in the range from 7-25 Hz, and/or with amplitudes in the range from 1-10 mm, or 3-7 mm.

16. Ergometer as claimed in claim 1, wherein it is a bicycle ergometer.

17. Ergometer as claimed in claim 1, wherein the vibration unit is disposed below the bearing, and wherein the con rod head is coupled directly to the bearing, in that it forms a bearing shell for the bearing, and wherein the con rod solely and without any further guide supports substantially the entire load directed vertically downward on the bearing, wherein the axis of the main shaft runs parallel to the axis of the bearing.

18. Ergometer as claimed in claim 1, wherein the bearing of the pedal device is mounted in a vertical linear guide having a linear slide, wherein the linear slide at the top is fixedly connected to the bearing, and at the bottom is connected to the con rod head (1a), wherein the axis of the main shaft runs parallel to the axis of the bearing.

19. Ergometer as claimed in claim 2, wherein a floor plate is disposed, the main shaft and also the motor being disposed therebelow and the pedal device being disposed thereabove, wherein provided in the floor plate is a recess through which the con rod passes and by way of which the con rod head thereof is coupled directly to the bearing.

20. Ergometer as claimed in claim 1, wherein a brake is disposed substantially at the same level as the pedal device, which brake by way of a force transmission element, in the form of a chain, of a timing belt or of a V-belt, is coupled to the pedal device, and wherein the bearing of the pedal device is mounted so as to be pivotable about a horizontal swivel axle disposed at the level of an axle of the brake, wherein the swivel axle is disposed in such a manner that the pivoting movement at the location of the bearing is permitted substantially exclusively in the vertical direction.

21. Ergometer as claimed in claim 5, wherein the swivel axle mounting of the bearing is defined by a substantially fork-shaped construction in which the fork ends of the arms are mounted so as to be rotatable about the swivel axle, and the opposite converged arms are connected to the bearing, in that the converged region forms a bearing receptacle for the bearing of the pedal device.

22. Ergometer as claimed in claim 5, wherein the vibration unit is disposed below this brake, above a floor plate, and wherein the coupling of the con rod to the bearing is implemented by at least one strut which runs obliquely upward and connects the con rod head directly or indirectly to the bearing, and wherein this strut is furthermore rigidly connected to the swivel axle mounting.

23. Ergometer as claimed in claim 1, wherein the ergometer is mounted on a base plate which acts as a mechanical high-pass filter for the vibrations generated by the vibration unit, and/or in that a further eccentric disk by way of which a counterweight is set in a compensating vibration is disposed on the main shaft, wherein this further eccentric disk is disposed on the main shaft by way of eccentricity which is counter to the eccentric disk for driving the con rod.

24. Ergometer as claimed in claim 8, wherein a brake is disposed substantially at the same level as the pedal device, which brake by way of a force transmission element, in the form of a chain, of a timing belt or of a V-belt, is coupled to the pedal device, and the counterweight is mounted so as to be pivotable about a horizontal swivel axle mounting disposed at the level of an axle of the brake, wherein the swivel axle is disposed such that the counterweight in the region of the bearing performs the pivoting movement substantially exclusively in the vertical direction, wherein the counterweight in the region of the bearing has a weight head, and this weight head at least partially encompasses the bearing region at the top and the bottom in the shape of a fork.

25. Ergometer as claimed in claim 1, wherein the eccentric disk and/or an further eccentric disk are/is mounted on the main shaft so as to be displaceable and adjustable along a direction perpendicular to the rotation axis of the main shaft, wherein this mounting is implemented by a gate guide in which at least one adjustment element when displaced along the axis of the main shaft causes a displacement of the eccentric disk along a direction perpendicular to the rotation axis of the main shaft.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Preferred embodiments of the invention will be described hereunder by means of the drawings which serve only for the purpose of explanation and are not intended to be limiting.

[0042] In the drawings:

[0043] FIG. 1 shows substantial elements of a vibration unit for an ergometer according to a first embodiment in an exploded illustration;

[0044] FIG. 2 shows the vibration unit according to FIG. 1 in a sectional illustration in a), in a detail fragment according to A in FIG. 2a) in b);

[0045] FIG. 3 shows substantial elements of a vibration unit for an ergometer according to a second embodiment in an exploded illustration;

[0046] FIG. 4 shows the vibration unit according to FIG. 3 in a sectional illustration;

[0047] FIG. 5 shows substantial elements of a vibration unit for an ergometer according to a third embodiment in an exploded illustration;

[0048] FIG. 6 shows the vibration unit according to FIG. 5 in a sectional illustration;

[0049] FIG. 7 shows different arrangements of the vibration unit, wherein illustrated in

[0050] a) is an embodiment in which the bottom bracket bearing by way of a swing arm is mounted directly from below by the con rod, in

[0051] b) is an embodiment in which the bottom bracket bearing is mounted without a swing arm in a linear mounting to which the vibration unit is coupled from below, and in

[0052] c) is an embodiment in which the vibration unit is disposed below the brake, the bottom bracket bearing is mounted by way of a swing arm, and a counterweight is provided;

[0053] FIG. 8 shows a lateral view of the embodiment according to FIG. 7 b);

[0054] FIG. 9 shows views of an embodiment according to FIG. 7c, wherein illustrated in a) for the sake of improved clarity of the individual elements is the suspension without a counterweight, and illustrated in b) is only the counterweight;

[0055] FIG. 10 shows different views of a further embodiment having the vibration unit coupled to the swing arm, and a counterweight, wherein illustrated in a) is the right-hand lateral view, in b) the left-hand lateral view, in c) the view from above, in d) an exploded drawing, in e) a view from obliquely above on the right, and in f) a view from obliquely below on the right.

DESCRIPTION OF PREFERRED EMBODIMENTS

[0056] FIG. 1 shows substantial elements of a vibration unit in an exploded illustration. The actual main shaft 12 is mounted by two bearings 11 and is set in rotation by a motor (not illustrated). The coupling to the motor can take place either directly or indirectly, for example by way of a V-belt. The motor is preferably a servomotor with an output in the range from 300-1600 W. The main shaft 12 herein is structured and on the left side 40 possesses a region in which said main shaft 12 is mounted by said bearings 11. The two ball bearings 11 serve for mounting the main shaft 12 to the bearing housing 19 and prevent an axial displacement of the main shaft 12. A shoulder face 12a follows on the right-hand side. This shoulder face 12a prevents an axial displacement of the eccentric disk 6, illustrated above on the right, and thus of the entire con rod 1. The eccentric disk 6 is placed displaceably on the sliding face 12b of the main shaft. The shell sleeves 9 are held in a form-fitting manner in the eccentric disk 6 and enable the eccentric adjustment of the eccentric disk 6 out of the rotation axis of the main shaft 12. The force transmission of the rotation of the main shaft 12 to the eccentric disk 6 takes place by way of the sliding face 12b by way of the shell sleeves 9 and thus onto the con rod 1. The eccentric disk 6 here does not bear directly on the sliding faces 12b of the main shaft, but the shell sleeves 9 are located therebetween, said shell sleeves 9 potentially being in two parts, as illustrated here, or else in one part. The contact faces 41 on the internal side of the eccentric disk 6 are correspondingly in contact with the external side of the shell sleeves 9, and the contact faces 42 of the latter on the internal side are in turn in contact with the sliding face 12b of the main shaft 12.

[0057] The shell sleeves 9 are preferably made from a material with frictional properties, for example from a plastics material with frictional properties (e.g. PTFE), and the main shaft 12 is made from metal, in order to achieve an optimal frictional pairing on the sliding face 12b.

[0058] The eccentric disk 6 in the axial recess 43 thereof possesses a sliding block 5 which runs so as to be tilted and transversely to the axis of said recess 43 and which determines the deflection of the eccentric disk 6 and thus the stroke of the con rod 1. The sliding block 5 bridges the recess 43 and is held by the screws 7. The fitting screws 7 fix the sliding block 5 in the eccentric disk 6 not only in a force-fitting but also in a form-fitting manner. For mounting the con rod 1, a ball bearing is fastened on the eccentric disk 6 by way of the bearing ring 3. To this end, the ball bearing by way of the bearing ring 3 is screwed to the eccentric disk by way of the screws 2. A clamping ring 8 which fixes the outer ring of the ball bearing 4 in a force-fitting manner to the con rod 1 by way of the screws 10 is provided on the other side. The screws 10 by way of the clamping ring 8 clamp the ball bearing 4 to the con rod 1.

[0059] The forces of the con rod 1 are transmitted to the main shaft 12 by way of the eccentric disk 6 by way of the shell sleeves 9, and transmitted to the bearing housing 19 by way of the bearing assembly 11. The con rod head 1a serves for receiving a bearing for the movable fixing to the linear unit or the swing arm (see further below).

[0060] A stud-shaped adjustment element 13 engages in a displaceable manner axially in an axial blind bore 38 of the main shaft 12. The adjustment element 13 by way of the fitting screws 14 is connected in a force-fitting and form-fitting manner to the bearing receptacle 15. The bearing receptacle 15 receives the bearing assembly 16 in the form of two ball bearing rings. A trapezoidal thread nut 17, which is mechanically connected (=secured against rotation) to the bearing housing 19 (not illustrated in FIG. 1) sits on this bearing assembly 16. 6 bores for the screw fitting to the bearing housing 19 are also illustrated in FIG. 1. The bearing assembly 16 is adjustable without play in the axial direction, and is fastened to the trapezoidal spindle 18 by way of the shaft clamping nut 20 and the locking ring 21 (neither illustrated in FIG. 1, cf. FIG. 2). The trapezoidal spindle 18 moves the adjustment element 13 in the axial direction so as to vary the stroke of the con rod 1. Due to the bearing assembly 16, the trapezoidal spindle 18 does not rotate conjointly with the main shaft 12.

[0061] The adjustment element 13 is preferably made from a material with frictional properties, for example from a plastics material with frictional properties (e.g. PTFE), and the sliding block 5 is made from metal in order to achieve an optimal frictional pairing.

[0062] A gate opening in the form of a cut-out area 13a runs transversely in the adjustment element. This cut-out area possesses a substantially identical width to the thickness of the sliding block 5 and is however substantially longer. Said cut-out area is in alignment with the larger opening 39 when the adjustment element 13 is pushed into the blind bore 38. In other words, the sliding block 5 penetrates the openings 39 and 13a. The cut-out area 13a is thus part of the adjustment element 13. The sliding block 5 is positioned in the cut-out area 13a; the deflection of the eccentric disk 6 in a form-fitting manner is achieved by way of the planar faces of the sliding block 5 and of the cut-out area 13a of the adjustment element 13.

[0063] In this way, the eccentric disk 6 is eccentrically mounted on the main shaft 12. The lower ring of the con rod 1 in turn is rotatably mounted on the eccentric disk 6 by way of the bearing ring 4. When the main shaft 12 rotates, the eccentric disk 6 thus performs an eccentric movement which is transmitted to the lower ring of the con rod 1 and in this way is converted to a translation or oscillation at the con rod head 1a. The frequency of these oscillations are determined by the rotational frequency of the main shaft 12, and thus by way of the frequency of the motor that drives this shaft. The amplitude of the oscillation can be adjusted by the trapezoidal spindle 18. The further the adjustment element 13 is pushed into the blind bore 31, the more the eccentric disk 6 is displaced out of the axis of the main shaft 12 by way of the sliding block 5, and the larger the amplitude of the eccentricity and thus also of the movement at the con rod head 1a. The vibration generated at the con rod head 1a can thus be finely adjusted and controlled in terms of frequency as well as in terms of amplitude. Moreover, the con rod has a high mechanical stability and a very high directional stability, i.e. the vibrations thus generated run exactly along the direction of the con rod, i.e. the proposed device permits quasi unidirectional vibrations with an adjustable frequency and an adjustable amplitude along an exactly defined direction to be generated.

[0064] FIG. 2 in a) shows the vibration unit in a sectional illustration through the axis of the shaft in a general view, and in b) shows the details according to A in a). It can be seen here how a vibration unit of this type can be disposed below a floor plate 28 which serves as the central fastening receptacle for the vibration unit. The floor plate possesses a recess 44, the con rod 1 protruding freely upward through the latter. On the lower side of the floor plate 28 there is a left bearing housing 19 for mounting the main shaft, on the one hand, and a right bearing housing 19a for mounting the trapezoidal thread nut 17, on the other hand.

[0065] The main shaft 12 is mounted in the right bearing housing 19 by way of the bearings 11 already mentioned above, wherein a shaft clamping nut 20 which fixedly clamps the bearing assembly 11 for the purpose of minimizing the axial and radial play of the main shaft 12 is provided for fastening purposes. There is additionally a locking ring 21 which prevents inadvertent loosening of the shaft clamping nut 20.

[0066] The bearing assembly 11 in FIG. 2 is embodied as an O-bearing assembly by way of example. The force engages outside the bearing assembly 11. The radial and axial play of the main shaft 12 is adjusted as a result.

[0067] The only intended oscillation in the present invention is a deflection of the con rod head 1 which is substantially perpendicular to the floor plate.

[0068] FIG. 3 in an exploded view shows a second exemplary embodiment of a vibration unit, this time having two eccentric disks 6 which are mounted on the same shaft. In this case, two con rods 1 with a substantially shorter con rod arm are coupled to these two eccentric disks 6; one con rod serves for generating the actual effective vibration for the user, and the other con rod serves for generating the counter movement of the counterweight, which will be explained further below. The two eccentric disks 6 are disposed on the same main shaft 12, but here there is a separate sliding face 12b for each eccentric disk 6 on the main shaft 12, and the adjustment element 13 possesses two correspondingly assigned cut-out areas 13a with opposing tilt. In principle however, the two eccentric disks 6 are mounted on the main shaft 12 and controlled in terms of their eccentricity by the adjustment element 13 in an analogous manner as has already been described in the first exemplary embodiment. It is important here that the eccentricity of the two eccentric disks 6 is configured so as to be phase-shifted by 180?, this being guaranteed by the opposing tilt of the cut-out areas 13a and the correspondingly opposing tilt of the two sliding blocks 5 of the respective eccentric disk 6. If the adjustment element 13 is displaced in the recess 38 of the main shaft 12 by activating the trapezoidal spindle 18, which in this case is fastened by a locking ring 23, which prevents inadvertent loosening of the shaft clamping nut 22, and a shaft clamping nut 22 which fixedly clamps the bearing assembly 16 in the bearing receptacle 15, so as to mount the trapezoidal thread spindle 18 axially and radially without play, the one eccentric disk is quasi offset in a first direction, and the other eccentric disk is quasi offset in the opposite direction from the main axis. This leads to a phase shift of the eccentricity of the two eccentric disks 6 by 180?, specifically in a completely correlated manner, i.e. the adjustment by the single adjustment element 13 with the opposing tilts of the cut-out areas 13a automatically leads to there being exactly a phase shift of 180?, independently of the adjusted amplitude of the vibration. It is ensured in constructive terms in this way that the optimal phase shift of the two con rods is present at all times so that the compensation by the counterweight is provided in an optimal manner at any adjustment and at any vibration amplitude.

[0069] The second exemplary embodiment differs from the first exemplary embodiment inter alia also in that the main shaft 12 is coupled in a somewhat different way. Here, there is additionally a V-belt pulley 24 which serves for coupling a servomotor to the main shaft by way of a V-belt. The V-belt pulley 24 is fastened by a clamping nut, for example in the form of a taper-lock bush.

[0070] The second embodiment thus differs from the first embodiment in that compensation of unintended oscillations is possible. The term unintended oscillations is understood to mean in particular the oscillation of the floor plate 28 that is directed counter to the intended oscillation, as well as other oscillation which is not directed perpendicularly to the floor plate 28. The unintended oscillations are created by the eccentric which has not been balanced, wherein the imbalance of the eccentric is significantly caused by the adjustability of the con rod and the construction of the latter, which cannot be statically balanced due to the amplitude modulation of the stroke.

[0071] FIG. 4 shows the second exemplary embodiment in a sectional illustration; it can be seen here inter alia how the two con rods are mounted parallel next to one another on the same main shaft 12 by way of the two eccentric disks, how the V-belt pulley 24 for coupling a servomotor projects on the left side, and how the trapezoidal spindle for the adjustment of the eccentricity projects on the right side. It can thus be seen that a solution which is extremely compact in terms of construction is provided, in which the two con rods that absorb high loads are mounted in a stable manner.

[0072] The bearing face of the con rod head bearings 26 in FIG. 4 is designed to be larger than the con rod head bearings 27, so as to absorb the higher forces which arise under load during operation (for example under the influence of body weight).

[0073] The adjustment element 13 extends the respective sliding blocks for the crank, or for the compensation weight, in opposite directions. The two eccentric disks have to be axially rotated by 180? in relation to one another in order to be able to be deflected in opposite directions. This offset arrangement of the eccentric disks 6 can be better seen in FIG. 5.

[0074] FIG. 5 in an exploded view shows a third exemplary embodiment of a vibration unit, which in contrast to the second exemplary embodiment is provided so that the eccentricity of the two con rods 1, or of the assigned eccentric disks, can be individually adjusted for both, respectively. To this end, the main shaft 12 is no longer mounted on one side and on the other side open for control by way of the adjustment element 13, but the main shaft is mounted at both ends by way of the bearing rings 11, as can be seen in particular by means of FIG. 6, a sectional illustration. The main shaft is no longer configured with a blind bore but with an axial through-opening, such that individual adjustment elements 13 for the adjustment of the eccentricity of each eccentric disk 6 can be inserted from both sides now. Accordingly, there are trapezoidal spindles 18 on both sites, which control the respectively assigned adjustment element 13. The two adjustment element of the however again possess cut-out areas 13a with opposing tilt such that the eccentricity can in principle be adjusted individually but still so as to be phase-shifted by 180?. It is ensured in this way that the phase shift is always 180?, but that the amplitude of the vibration can be set differently for the two con rods. In this way it is possible for the vibration compensation by the counterweight to be adjusted even more finely, and to be adjusted in particular to environmental parameters or user parameters such that the compensation is always optimally guaranteed.

[0075] The third embodiment thus differs from the second embodiment in that the amplitudes of both con rods can be controlled in a mutually independent manner. According to this embodiment, compensation of unintended by oscillation balance can take place. The substantial difference in relation to the embodiment according to FIGS. 3 and 4 lies in that the adjustment element 13 is configured in two parts. Both adjustment elements 13 require a separate O-mounting and actuation by way of motors. The left trapezoidal spindle 18 controls the deflection of the compensation weight; the right trapezoidal spindle 18 controls the deflection of the crankshaft. The drive of the main shaft 12 in this embodiment is performed centrically between the two con rods 1.

[0076] The adjustment of the compensation can also take place manually, but it is also possible that the trapezoidal spindle or the plurality of trapezoidal spindles is/are actuated by way of a further actuator. It is thus possible, for example, for such an actuator to be actuated by feedback control, for example by way of a vibration sensor or else a plurality of vibration sensors, and a corresponding control unit. It is thus in particular also possible for such a control to be feedback-controlled in a self-teaching algorithm such that the vibrations measured by the vibration sensors are minimal where said vibrations are not to arise (for example on the floor plate), and are maximal or exactly in the desired range where said vibrations are to arise (for example at the bottom bracket bearing).

[0077] FIG. 6 is a sectional drawing of the exploded drawing 5. The length of the two adjustment elements 13 differs: a con rod stroke of zero is illustrated in FIG. 6. In order for the stroke to be varied, the right adjustment element 13 is moved toward the right, and the left adjustment element 13 is likewise moved toward the right by way of a rotation of the trapezoidal spindle 18; as a result, the deflection of the eccentric disks changes, said deflection can be seen in FIG. 6 on account of the different position of the play of the shell sleeves 9 (the right shell sleeves show the play at the top, the left at the bottom).

[0078] FIG. 7 now shows different possibilities of disposing a vibration unit of this type on a (bicycle) ergometer.

[0079] A first possibility, which is illustrated in a lateral view in FIG. 7b and also in FIG. 8, lies in that the vibration unit is disposed below a floor plate 28 such that the con rod 1 passes upward through this floor plate in a vertical direction through a recess in this floor plate. The bottom bracket bearing 29 of the ergometer is selectively mounted so as to be displaceable in the strictly vertical direction in a linear slide 34, the latter by way of a linear guide 35 being mounted on the floor plate. This linear slide 34 at the top is fixedly connected to the ball bearing 29 and at the bottom coupled to the con rod head 1a.

[0080] Provided in this way is a construction which selectively enables vibrations only in a strictly vertical direction, and the entire suspension and load of the vibration unit is handled by way of the front region below the bottom bracket bearing. Such a vibration unit can be combined with a customary brake 30 which is coupled by way of a force transmission element, for example a chain, a belt, a timing belt.

[0081] In this construction it is possible for a vibration unit according to the first exemplary embodiment described above to be used, i.e. with only a single con rod for the vibration at the bottom bracket bearing. However, it is also possible for a vibration unit according to the second or according to the third exemplary embodiment to be used. As is illustrated in FIG. 8, it is specifically possible for a counterweight 36 to be mounted so as to be phase-shifted by 180? in such a housing by way of a further con rod, so that the vibrations by way of the first con rod illustrated at the front in FIG. 8 are transmitted at the desired frequency and amplitude to the bottom bracket bearing, but that the vibrations in relation to the environment and in particular the floor plate 28, for example, are canceled in a manner quasi analogous to noise canceling. In practice, there are indeed significant issues in devices of this type by virtue of the artificially generated vibration. On the one hand, the artificially generated vibration leads to uncomfortable noise emissions, in particular because the floor plate, or corresponding legs connected thereto transmit the vibrations to the floor and the building etc.; however, there are also uncomfortable noise emissions as a result of the vibration of other components such as, in particular the brake, etc. Furthermore, issues arise on account of the vibration because devices of this type tend to be displaced by shaking and to quasi wander around. Last but not least, the vibrations lead to mechanical damage to the device per se and to the other components of the device, and the same applies to other devices disposed in the proximity to which the vibrations are unintentionally transmitted.

[0082] Vibrations of this type suitable for this device are typically in the range of up to 50 Hz. Low frequencies of 7-12 Hz with amplitudes in the range of up to 7-10 mm for neurostimulations, typically in a load range of approx. 100 W, have proven particularly suitable. Higher frequencies in the range from 15-25 Hz, for example, can also be used for athletes, in this instance with typically somewhat lower vibration amplitudes of up to 3-4 mm. In this instance, loads in the range of 200-300 W in terms of brake output are used. In this way, the vibrations and the amplitudes are in a range which is mechanically critical for other components, and the compensation by one or a plurality of counterweights is enormously important.

[0083] The crank bearing in FIG. 7b is thus fastened to a linear bearing 35 by way of a slide 34, wherein the linear bearing 35 is disposed perpendicularly to the floor plate 28. The con rod is connected to the linear slide such that a movement which is directed exclusively perpendicularly to the floor plate 28 results. The construction can likewise be implemented in an oscillating-compensating manner by way of a second con rod and a counterweight 36 as the second slide on the linear guide.

[0084] A further possibility of providing such a vibration device on an ergometer is illustrated in FIG. 7a. Here too, a vibration which substantially runs strictly in the vertical direction is generated by the con rod 1 (cf. arrow). However, the con rod 1 serves as the sole mounting for the bottom bracket bearing in the vertical direction, so that an extremely slender construction is provided. In order for this construction to be made possible, there is now additionally a swing arm 32. This swing arm 32 is a second mounting of the bottom bracket bearing substantially about the axle 45 of the brake. The swing arm 32 possesses two arms 46, a first arm 46 and a second arm 46. The two arms engage on the axle 45 at different ends of this axle and pivotally mount the bottom bracket bearing 29. By virtue of the fact that the axle of the bottom bracket bearing 29 and the axle of the brake 45 are disposed approximately at the same level, it is thus ensured that the swing arm 32 enables a mobility of the bottom bracket bearing 29 at the bottom bracket bearing in substantially only the vertical direction such that the strictly vertical vibration is ensured. If the brake is disposed, for example, closer to the floor plate or substantially below the bottom bracket bearing in such an ergometer, the swing arm 32 should not be fitted to the axle of the brake but to a separate axial bearing approximately at the level of the bottom bracket bearing, precisely so as to ensure that only vertical vibrations are possible on the bottom bracket bearing.

[0085] In FIG. 7a, the center of the con rod head 1a is identical to the center of the crank bearing. The crank bearing is mounted only by the con rod and the swing arm. Here, all forces except for those in the direction of the con rod are absorbed by the swing arm. The adjustable braking force of the brake 30 is transmitted to the crank 33 by way of the force transmission element 31. The braking effect can be adapted by suitable measures which are known to the person skilled in the art, such as translations between the crankshaft and the brake, for example.

[0086] A further possibility of providing such a vibration device on an ergometer is illustrated in FIG. 7c. Here, the vibration device is disposed below the brake, and the bottom bracket bearing is quasi-free-floating. A particularly compact and elegant construction mode is thus created. The swing arm 32 is again fitted to the axle 45 of the brake and mounts the bottom bracket bearing 29 such that the latter can only be moved in the vertical direction. The bottom bracket bearing 29 in this construction is supported in the vertical direction only in that the swing arm 32 has a strut which is directed obliquely downward toward the vibration device and by way of a con rod receptacle 37 is coupled to one of the two con rods of the vibration device. In other words, the swing arm 32 comprises a means for coupling the vibration of the vibration device, and it is ensured by the geometric design and the levers used that the vibration at the bottom bracket bearing is converted to a strictly vertical vibration, despite said vibration on the device bearing on the con rod in an oblique direction. Cf. in this regard in particular also FIG. 9a in which this construction is illustrated, wherein only the swing arm 32 with the strut 46 is illustrated for improved clarity.

[0087] FIG. 7c thus shows a variant in which the oscillation drive is disposed not below the ball bearing but outside the crank region. As a result, components below the crankshaft are dispensed with and a very compact construction mode is thus possible. The con rod is movably connected to the swing arm at the con rod receptacle 37 of the swing arm.

[0088] In such a construction, a corresponding counterweight 36 is advantageously mounted in a very similar manner and actuated by the second con rod which is phase-shifted by 180?. Cf. in this regard in particular FIG. 9b in which this construction of the counterweight is illustrated and the swing arm for the bottom bracket bearing is omitted. The counterweight 36, or rather the weight head 50 of the counterweight, in this case is fitted to the axle 45 of the brake in a similar manner as the swing arm by way of a first strut 47. On the other side, there is a further strut 49 between the weight head 50 and a con rod receptacle 37a for the counterweight, said strut 49 being directed downward, and a third strut 48 which fits the con rod receptacle of the counterweight to the axle 45 of the brake so as to guarantee the required stability of the mounting. The counterweight, in particular the weight head 50 thereof, is thus disposed in a manner mounted in an optimal space-saving manner and nevertheless in a protruding manner between the two arms 46 and 46 of the swing arm, and can there also provide the optimal compensation effect.

[0089] Illustrated in FIG. 10 is a further exemplary embodiment of an ergometer. The components corresponding to the components described above are provided with the same reference signs. In this exemplary embodiment, the swing arm is designed with a plurality of struts on both sides, inter alia also with additional vertical struts and horizontal struts. In principle however, the attachment to the con rod 1 is analogous to that as described further above in the context of FIGS. 7 and 9. The counterweight is also mounted in a similar way; the weight head 50 here is constructed as a layered body which makes it possible for the mass of the weight head to be optionally adapted on-site in that further layers are added. Furthermore, the weight head 50 is configured as a fork, so to speak, the arms of the latter at least partially encompassing the bottom bracket bearing 29 at the top and the bottom. In this way, the counterweight can be disposed ideally close to the bottom bracket bearing and in the region of the latter, such that the compensation of the vibration can take place in an optimal manner. The counterweight here is mounted by way of a mounting body 47, which is likewise configured with a plurality of struts, and is again coupled to the vibration unit by way of the con rod receptacle 37a for the counterweight. This mounting body in a certain sense penetrates struts of the swing arm and is thus mounted in an optimal, space-saving and compact manner.

[0090] Likewise to be seen in this exemplary embodiment is the actuator 52 with the assigned V-belt 51 for the adjustment of the trapezoidal thread nut, and correspondingly for the adjustment of the eccentricity and the associated amplitude of the vibration. The motor 54 for the drive of the main shaft 12, and the corresponding V-belt 53, can likewise be seen.

TABLE-US-00001 LIST OF REFERENCE SIGNS 1 Con rod 28 Floor plate 1 Con rod for counterweight 29 Crank bearing 1a Con rod head 30 Brake 2 Screws 31 Force transmission element 3 Bearing ring 32 Swing arm 4 Ball bearing 33 Crank 5 Sliding block 34 Linear slide 6 Eccentric disk 35 Linear guide 6 Eccentric disk for counterweight 36 Counterweight 7 Fitting screws 37 Con rod receptacle swing arm 8 Clamping ring 37a Con rod receptacle counterweight 9 Shell sleeves 38 Axial blind bore in 12 10 Screws 39 Radial through-opening 11 Bearing assembly 40 Fastening region of 12 12 Main shaft 41 Contact faces of 6 on 9 12a Shoulder face 42 Contact faces of 9 on 12b 12b Sliding face 43 Recess in 6 13 Adjustment element 44 Recess in 28 for 1 13a Cut-out area 45 Axle of the brake 14 Fitting screws 46 Strut of 32 15 Bearing receptacle 46, 46 Arms of 32 16 Bearing assembly 47 Weighted strut to the axle of the brake 17 Trapezoidal thread nut 48 Weighted strut from the axle of the brake to the con rod receptacle of the counterweight 18 Trapezoidal spindle 49 Weighted strut from the con rod receptacle of the counterweight to the weight head 19 Left bearing housing 50 Weight head 19a Right bearing housing 51 V-belt for activating the trapezoidal thread nut main shaft 12 20 Shaft clamping nut 54 Motor for driving main shaft 12 21 Locking ring 22 Shaft clamping nut 23 Locking ring 24 V-belt pulley 25 Clamping nut 26 Con rod head bearing 27 Con rod head bearing 52 Motor for activating the trapezoidal thread nut by way of 51 53 V-belt for the drive motor of