Sealing assembly for sealing rolling bearing of pedal support unit of bicycle

Abstract

The invention relates to a sealing arrangement for sealing a rolling bearing (2) of a pedal bearing unit of a bicycle, in particular of an electrically drivable bicycle, characterized in that a sealing ring (1) with a sealing head (3, 44) is arranged in a sealing seat (4) for fixation, which is retracted radially outward at the inner diameter of a bearing outer ring (5), at least one statically acting sealing lip (18, 28, 29, 30, 43) is arranged for sealing a bearing seat (8) of a rolling bearing (2) on a stationary component (9), said sealing lip starting from the sealing head (3, 44) and the inner diameter (DA) of the projection (20, 47) on the sealing head (3, 44) being arranged radially outward above a shoulder (15) of the sealing seat (4), the sealing lips (18, 28, 29, 30, 43) are arranged in such a way that an axial component force (F) from a static contact of the sealing lips (18, 28, 29, 30, 43) can be introduced into the bearing outer ring (5) without torque via a sealing head (3, 44) on the sealing seat (4). The invention also relates to a rolling bearing assembly having at least one rolling bearing (2) having such a sealing assembly.

Description

Technical Field

[0001] The invention relates to a sealing arrangement for sealing a rolling bearing of a pedal bearing unit of a bicycle, in particular one that can be driven electrically. The invention also relates to a rolling bearing arrangement having at least one rolling bearing, which has such a sealing arrangement. Background Art

[0002] DE 10 2013 101 621 A1 discloses a bicycle pedal support device. The bicycle pedal support device comprises a bearing assembly, which is inserted into a first bearing fixing section with an inner surface of a bearing component, and the bearing component can be inserted into a bicycle frame. The inner surface comprises a first bearing passage surface, through which the bearing assembly can pass in a pressed-in state, wherein a sealing component is mounted on the bearing passage surface. Summary of the invention

[0003] Therefore, the object of the present invention is to provide a sealing assembly and a rolling bearing assembly of the aforementioned type, which can realize a high-performance seal which saves construction space, has low friction and is reliable in operation in a structurally simple and cost-effective manner.

[0004] This object is achieved by the features of claim 1 and alternatively by the features of claim 9 or 10. Further advantages and claimed embodiments emerge from the respective dependent claims, the description and the drawings.

[0005] The cam is an electrically driven bicycle having a plurality of sealing members, each of which is provided with a plurality of sealing members, each of which is provided with a plurality of sealing members, each of which is provided with a plurality of sealing members.

[0006] As a result, a reliable tight fit of the sealing ring in the sealing seat during assembly and in the final assembled state can be ensured in a structurally simple manner through the interaction of the sealing head and the sealing seat, so that the axial force component caused by the contact of the sealing lip is directly introduced into the outer ring. Failures caused by deformation or tilting of the sealing ring under preload during operation can be reliably avoided, thereby avoiding: reduced sealing performance, in particular increased friction or contact loss of the sealing lip, or even undesired contact of the sealing ring with the rolling element cage and the rolling elements.

[0007] Furthermore, a high-performance seal for sealing a rolling bearing can be realized which is arranged in a stable, tight-fitting manner and has a small overall width and which simultaneously seals the bearing seat of the rolling bearing on a stationary component, in particular on the housing, on the outside of the bearing. By sealing the bearing seat, corrosion of surfaces on the stationary component which are machined for producing the bearing seat can be avoided in particular. At the same time, the pedal support housing can be sealed from the surrounding environment.

[0008] In this way, a high-performance seal is achieved for a pedal bearing unit of a bicycle, which seal prevents water and dirt particles from penetrating into the pedal bearing unit and the pedal bearing housing even when riding off-road.

[0009] The sealing arrangement can therefore be used particularly advantageously for sealing a rolling bearing of a pedal bearing unit of an electrically driven bicycle, for example an electric bicycle or an assisted bicycle.

[0010] The sealing seat is preferably designed as a radial recess on the bearing outer ring, which can be produced particularly simply and cost-effectively.

[0011] In another preferred embodiment of the present invention, the sealing ring is implemented as a thin ring seal to seal a rolling bearing implemented as a thin ring bearing. Here, the sealing ring can be implemented so that its structural width is about one third or one quarter of the structural width of a common high-performance seal, especially a so-called cassette seal.

[0012] In another preferred design of the present invention, the sealing lip extends conically narrowing toward the axial outside to abut against the sealing surface of the fixed component. In this case, the sealing lip can be easily adapted to the assembly conditions of the fixed surrounding environment by its length. For example, the sealing lip can simply abut against the axial sealing surface or the sealing surface inclined relative to the bearing axis. Preferably, a free space is formed in the radial direction, into which the sealing lip can expand in the radial direction or flip or fold when compressed by the preload force.

[0013] Another improvement of the invention is that the sealing lip extends axially outward in an axially parallel manner relative to the bearing axis and forms an inner cone as a sealing surface at the inner diameter, thus at the inner circumference or radially inside, which widens axially outward toward the free end, and the sealing lip can be in contact with the axial sealing surface of the fixed component with the sealing surface when axially compressed by the preload force or in the turned or folded state. It is also conceivable that the sealing lip forms an outer cone at the outer diameter that narrows axially outward toward the free end.

[0014] In another preferred design of the present invention, the sealing lip engages with the free end facing radially outward into a gap at the axially outer end side of the bearing outer ring. The sealing lip can abut against the end side of the bearing outer ring with a first abutment surface under preload on one side and can abut against a counter surface on the bearing seat of a fixed component with a second abutment surface under preload on the other side for sealing.

[0015] Preferably, at least one of the contact surfaces is designed in cross section as a wave-shaped configuration with a plurality of axial elevations and depressions. This configuration serves to accommodate expansion of the sealing lip in the gap when the sealing lip is compressed in the prestressed state. Preferably, such a wave-shaped cross-sectional configuration is provided at both contact surfaces. It is also conceivable that, as an alternative or in addition, the counter surface is configured as described above at a fixed component.

[0016] In another development of the invention, the sealing lip is connected to the sealing head in the region of the sealing seat in such a way that the sealing lip forms a contact area on the sealing seat toward the radial outside and delimits a free space toward the radial inside, into which the sealing lip can be accommodated by being folded or folded with its free end toward the radial inside in a state where it is prestressed for sealing and abuts against a fixed component. In addition, in this way, the sealing lip can be arranged in the sealing seat with a greater radial height above the shoulder toward the radial outside and simultaneously supported on the shoulder.

[0017] In another particularly preferred design of the present invention, the sealing ring is tightly attached to the bearing inner ring radially with a first dynamic sealing lip and axially with a second dynamic sealing lip in the radial direction. Preferably, a third sealing lip is provided, which forms a labyrinth seal with the bearing inner ring.

[0018] Preferably, the first dynamic sealing lip is arranged axially outside and the third sealing lip is arranged axially inside. Here, preferably, the second dynamic sealing lip is arranged in a region axially between the first dynamic sealing lip and the third sealing lip.

[0019] The sealing ring can have reinforcements, for example corner rings, in particular for reinforcement and for avoiding tolerances during the path-controlled mechanical assembly process.

[0020] Preferably, an elastomer is provided as the material for the sealing ring. The sealing ring can be produced simply and cost-effectively by vulcanization, in particular the elastomer can be vulcanized onto the reinforcement.

[0021] The sealing head is preferably constructed completely from an elastomer and is arranged in a tight-fitting manner in the sealing seat for fixation.

[0022] The object according to the invention is also achieved by a sealing assembly for sealing a rolling bearing of a pedal support unit of a bicycle, in particular an electrically driven bicycle, wherein a sealing lip is arranged with a sealing head in a sealing seat for fixation, the sealing seat is set back radially inwards at the outer diameter of the bearing inner ring, and at least one dynamically acting sealing lip is arranged to abut against a fixed component, the sealing lip starting from the sealing head.

[0023] Here, the sealing lip is arranged such that the outer diameter of the protrusion of the sealing lip at the sealing head is below the outer diameter of the shoulder of the sealing seat toward the radial inside, so that the axial force component caused by the contact of the sealing lip at the fixed component can be introduced into the bearing inner ring at the sealing seat without torque. The above-mentioned advantages are achieved in this way. In a preferred design of the present invention, the sealing ring can be implemented as a thin ring seal as described above.

[0024] The object according to the invention is also achieved by a rolling bearing assembly for a pedal bearing unit of a bicycle, in particular one that can be driven electrically, which has at least one rolling bearing, and the at least one rolling bearing has an aforementioned sealing assembly. The above-mentioned advantages are achieved thereby. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Further features of the invention claimed for protection are apparent from the following description and from the accompanying drawings, which further illustrate the invention. Therein:

[0026] Figure 1 A sectional view of a first exemplary embodiment of a sealing arrangement according to the invention for sealing a rolling bearing for a pedal support of a bicycle, in particular one that can be driven electrically, is shown.

[0027] Figure 2 Shows Figure 1 A partial enlarged view of

[0028] Figure 3 A partial cross-sectional view showing a second embodiment of a sealing assembly according to the present invention is shown,

[0029] Figure 4 Shows Figure 3 The final assembly state of the sealing component,

[0030] Figure 5 A partial cross-sectional view showing a third embodiment of a sealing assembly according to the present invention is shown,

[0031] Figure 6 Shows Figure 5 The final assembly state of the sealing component,

[0032] Figure 7 A partial cross-sectional view showing a fourth embodiment of a sealing assembly according to the present invention is shown,

[0033] Figure 8 Shows Figure 7 The final assembly state of the sealing component,

[0034] Fig. 9 A partial cross-sectional view showing a fifth embodiment of a sealing assembly according to the present invention is shown,

[0035] Fig.10 Shows Fig. 9 The final assembly state of the sealing component,

[0036] Fig.11 A sectional view of a sixth exemplary embodiment of a sealing arrangement according to the invention for sealing a rolling bearing for a pedal support of a bicycle, in particular one that can be driven electrically, is shown.

[0037] Fig.12 Shows Fig.11 Partially enlarged view. DETAILED DESCRIPTION

[0038] The drawings show by way of example various views and embodiments of a sealing assembly according to the invention for sealing a rolling bearing for a pedal support of a bicycle that can be driven electrically in particular. The rolling bearing assembly according to the invention is also clearly shown in this schematic diagram.

[0039] exist Figure 1 The sealing assembly according to the invention shown in the first embodiment in FIG. 1 has a sealing ring 1 for sealing a rolling bearing 2 on the outer side facing the surrounding environment. The sealing ring is designed as a thin ring seal with a small axial structural width. The sealing ring is fixed radially outside with a sealing head 3 in a tight fit in a sealing seat 4 at the axially outer edge of the bearing outer ring 5, and the sealing ring cooperates with the bearing inner ring 7 in a sealing manner with a sealing waist 6. The sealing seat 4 is preferably designed as a radial recess that can be manufactured particularly simply and cost-effectively at the inner diameter and thus the inner circumference of the bearing outer ring 5.

[0040] The rolling bearing 2 is designed as a deep groove ball bearing and is arranged with a static bearing outer ring 5 in a stationary component 9, preferably a bearing seat 8 of a housing. The bearing inner ring 7 is arranged on the shaft 10 so as to be rotatable together with the shaft 10 about the bearing axis and the rotation axis 11 shown.

[0041] The sealing ring 1 serves to seal the rolling bearing 2 on its axial outer side. The rolling bearing 2 is shielded on its axial inner side facing the interior of the housing 9 by a rolling element cage 12 .

[0042] The material of the sealing ring 1 is an elastomer. In order to reinforce the sealing ring 1, a reinforcement 13 is provided, which is implemented as an angle ring and has a cylindrical section 14 in the area of ​​the sealing head 3, which extends in the axial direction with a free end. Here, the sealing head 3 is completely made of elastomer.

[0043] The reinforcement 13 extends as an axial sealing disk starting from the cylindrical section 14 radially inwards to the sealing collar 6. The sealing ring 1 is vulcanized onto the reinforcement 13, which is covered with an elastomer in the region of the sealing disk for protection against corrosion on the outside.

[0044] The sealing seat 4 is designed to be recessed radially outwards by a shoulder 15 at the inner diameter and thus at the inner circumference of the bearing outer ring 5 .

[0045] In the bearing seat 8, the rolling bearing 2 bears with its axially outer end face 16 against a corresponding counter surface 17 as a sealing surface. In order to seal the bearing seat 8 at the contact between the end face 16 and the counter surface 17, a static sealing lip 18 is formed on the sealing ring 1.

[0046] The static sealing lip 18 is vulcanized into an annular shape at the free axial outer side of the sealing head 3 and extends axially outward in a conical shape, gradually narrowing, and the static sealing lip abuts against the axial sealing surface 19 at the inner side of the housing 9 to seal the bearing seat 8. The sealing of the bearing seat 8 prevents corrosion of the machined surface on the housing 9.

[0047] The static sealing lip 18 is arranged in the sealing seat 4 in such a way that the static sealing lip with its projection 20 on the sealing head 3 has an inner diameter D A Radially outwardly it is located above the shoulder 15 and therefore at the inner diameter D of the shoulder 15 I Above, the inner diameter D I Here, it coincides with the inner diameter of the bearing outer ring 5. As a result, the axial force component F of the axial static contact of the sealing lip 18 on the housing 9 can be introduced directly into the bearing outer ring 5 via the sealing head 3 in the sealing seat 4 without torque. In this way, damage to the sealing ring 1 due to deformation or tilting of the sealing ring under preload during assembly or in the final assembly state is avoided. For the sake of clarity, the force action line of the axial force component F is shown by a dotted arrow.

[0048] exist Figure 2 , the sealing head 3 and the static sealing lip 18 are shown in each case in an unprestressed initial state, with the sealing head 3 and the static sealing lip 18 having the illustrated overlap or the illustrated excess in the sealing seat 4 or on the sealing surface 19 on the inner side of the housing 9 .

[0049] In the region of the sealing lip 18 extending radially inwardly downward, an annular free space 21 is defined by the sealing lip and the sealing body or reinforcement 13 , into which the sealing lip 18 expands or inverts or tilts under preload during compression.

[0050] The sealing head 3 forms an annular flat contact surface 22 on its axial inner end side, by means of which the sealing head can contact the annular axial mating surface 23 formed at the shoulder 15 in the sealing seat 4 when the sealing lip is preloaded. Here, a static sealing lip 18 with a projection 15 is connected to the axial outer side of the sealing head 3 facing away from the axial contact surface 22.

[0051] The sealing head 3 always forms an outer contour 24 which tapers axially inwardly in the unprestressed initial state of the sealing lip 18 radially outwardly, with which the sealing head is at least partially seated in the annular radial concave recess 25 in the sealing seat 4 in the prestressed state of the sealing ring 1. The sealing head 3 has the required excess shown in the unprestressed state. In the prestressed state of the static sealing lip 18, the axial force component F can be directly introduced into the bearing outer ring 5 in the interaction between the contact surface 22 on the sealing head 3 and the counter surface 23 on the sealing seat 4 and the outer contour 24 on the sealing head 3 and the concave recess 25 on the sealing seat 4.

[0052] The sealing ring 1 is implemented radially inside with two dynamic sealing lips 26, 27 starting from the sealing waist 3 and tightly abuts against the bearing inner ring 7 rotatably arranged on the shaft 11 under preload. The first dynamic sealing lip 26 arranged axially outside abuts against the bearing inner ring 7 radially and the second dynamic sealing lip 27 abuts against the bearing inner ring 7 axially inward. The third sealing lip 59 arranged axially inside forms a labyrinth seal with the bearing inner ring 7.

[0053] Thus, a more reliable, low-friction, high-performance seal for sealing a rolling bearing 2 can be realized in a structurally simple manner by means of the proposed sealing assembly, which has a small overall width and which simultaneously seals the bearing seat 8 of the rolling bearing 2 at the bearing outer ring 5 via the static sealing lip 18. The sealing assembly can be implemented with a sealing ring 1 having a small overall width, which is preferably a thin-ring seal for sealing a thin-ring bearing. In this case, the thin-ring seal can have a minimum overall width of about 1 mm, depending on the assembly environment and the conditions of use.

[0054] Therefore, the proposed sealing assembly can be particularly advantageously used in a rolling bearing assembly for sealing an electrically driven bicycle, such as an electric bicycle or a power-assisted bicycle. Preferably, the shaft 10 is arranged as a pedal crankshaft in the pedal support housing 9 and is supported at each end in a bearing seat 8 on the pedal support housing 9 via the aforementioned rolling bearing 2. At the same time, the pedal support housing 9 is sealed relative to the outside by means of the aforementioned sealing assembly. Here, the static sealing lip 18 acts on the inner side of the pedal support housing 9 to seal the bearing seat 8.

[0055] exist Figures 3 to 8 Shown in Figure 1 and Figure 2 A variant of the sealing assembly in , each having a sealing ring 1 with a modified static sealing lip 28, 29, 30. Figure 3 , Figure 5 and Figure 7 1 shows the sealing ring 1 in each case in the unprestressed initial state with the indicated excess at the sealing head 3 , 44 and at the sealing lips 28 , 29 , 30 . Figure 4 , Figure 6 and Figure 8 The sealing ring 1 is shown to have a sealing lip 28, 29, 30 which is prestressed for sealing and bears against the housing 9. For the sake of clarity, the force action line of the axial force component F is shown by a dashed arrow.

[0056] In accordance with Figure 3 and Figure 4 In the second embodiment of the proposed sealing assembly, a static sealing lip 28 is provided, which is relative to the Figure 1 and Figure 2 The sealing lip 18 in the first exemplary embodiment is designed to be extended and bears against the modified sealing surface 31 on the inner side of the housing 9, which is designed as an inner cone. Figure 4 In the prestressed state shown, the sealing lip 28 can be turned or folded into a free space 32 which is located radially inwardly below the sealing lip 28 and which is defined by the sealing lip and the sealing body or reinforcement 13, and thereby forms an operationally reliable, highly sealed contact on the sealing surface 31 on the housing 9. In this way, the sealing ring 1 for sealing the bearing seat 8 can be adapted to the assembly environment on the housing 9 by the length of the static sealing lip 28.

[0057] exist Figure 5 and Figure 6 In the third embodiment shown, a static sealing lip 29 is provided, which extends axially outwardly in a direction parallel to the bearing axis 11. Starting from the free end 33, the static sealing lip forms an inner cone at the inner diameter, thus at the inner circumference, which narrows in the axial inward direction and serves as a sealing surface 34. The static sealing lip is formed as a sealing surface 34 when the sealing surface is preloaded. Figure 6In the state folded or folded radially outward, the housing 9 is shown in the drawing, and bears against an axial sealing surface 35 on the inner side of the housing 9 .

[0058] Figure 7 and Figure 8 A fourth exemplary embodiment of the proposed sealing arrangement is shown, in which the sealing surface 30 engages with the free end 36 facing radially outward into a recess 37 at the axially outer end face of the bearing outer ring 5. Figure 8 In the pre-tensioned state, the sealing lips respectively abut tightly against the end side of the bearing outer ring 5 with an annular first abutment surface 38 axially inwardly and abut tightly against the annular axial mating surface 17 with an annular second abutment surface 39 axially outwardly, which serves as a sealing surface at the bearing seat 8 of the housing 9.

[0059] The sealing lip 30 is configured with ridges 41 and recesses 42 in a corrugated manner at the two contact surfaces 38, 39 in the axial direction in the cross section. Here, the ridges 41 at one contact surface 38, 39 correspond to the recesses 42 at the other contact surface 38, 39 respectively. The ridges 41 and recesses 42 of the contact surfaces 38, 39 are configured in an annular manner in the circumferential direction, are concentric in the axial top view, and are arranged alternately in a corrugated manner in the radial direction. Through the configurations 41, 42, the sealing lip 30 can expand in the gap 37 when compressed and as shown in FIG. Figure 8 Furthermore, the axial force component F of the preload force can be introduced at least partially via the sealing lip 30 directly into the bearing outer ring 5 .

[0060] The proposed sealing assembly is based on Fig. 9 and Fig.10 In the fifth embodiment, in addition to the static sealing lip 43, the sealing head 44 and the reinforcement 45 of the sealing ring 1 are relative to the Figure 1 and Figure 2 The reinforcement 45 engages radially with its radially outer end section into the sealing seat 4 and forms a contact surface 46 on its axial inner side for contacting with the counter surface 23 on the shoulder 15 of the sealing seat 4 .

[0061] The sealing head 44 is vulcanized at the radially outer end of the reinforcement 45. Furthermore, in the region of the radial concave recess 25 at the sealing seat 4, the sealing lip 43 is connected to the sealing head 44 with its projection 47. In the prestressed state of the sealing lip 43, as shown in FIG. Fig.10As shown in the figure, the sealing lip 43 abuts against a flat axial sealing surface 50 on the inner side of the housing 9. Here, the reinforcement 45 abuts with the abutment surface 46 at least partially axially against the counter surface 23 at the shoulder 15 in the sealing seat 4. The sealing head 44 and the sealing lip 43 each form abutment areas 48, 49 radially on the outside in the region of the concave recess 25 of the sealing seat 4.

[0062] As a result, the sealing lip 43 is supported directly in the sealing seat 4 at the contact area 49. In addition, the sealing lip is arranged in the sealing seat 4 with its projection 47 facing radially outwardly connected to the sealing head 44. Overall, the axial force component F of the preload force of the sealing lip 42 can be better introduced into the sealing seat 4 at the bearing outer ring 5. For the sake of clarity, Fig.10 The force action line of the axial force component F is shown by the dotted arrow.

[0063] At the same time, the sealing lip 42 and the sealing head 43 define an annular free space 51 at least partially in the region of the sealing seat 4, which is enlarged as a whole and as in Fig.10 As shown in FIG. 4 , the sealing lip 43 is accommodated in this free space with its free end being folded or folded radially inwards.

[0064] In accordance with Fig.11 and Fig.12 In a sixth embodiment of the proposed sealing assembly, which is used for sealing a rolling bearing 2 of a pedal support of a bicycle that can be driven electrically in particular, the sealing assembly is provided with a sealing ring 52, which is arranged with a tight fit on the bearing inner ring 7. For fixing, the sealing ring 52 is arranged in a sealing seat 55, which is set back radially inwards relative to a shoulder 54 at the outer diameter of the bearing inner ring 7.

[0065] The sealing lip 56 is vulcanized into an annular shape on the free axial outer side of the sealing head 53 and extends conically from the sealing head 53 toward the axial outer side, and the sealing lip is tightly attached to the preferably axial running surface at the inner side of the housing. Here, the sealing lip is used as a dynamic seal.

[0066] The sealing lip 56 is arranged on the sealing seat 55 so that its outer diameter D of the projection 58 on the sealing head 53 is B Radially inwardly, below the shoulder 54 , thus at the outer diameter D of the shoulder 54 C The outer diameter of the shoulder coincides with the outer diameter of the bearing inner ring 7. As a result, the axial force component F of the sealing lip 55 in the axial dynamic contact on the housing can be introduced directly into the bearing inner ring 7 via the sealing head 53 in the sealing seat 55 without torque. Fig.12The dotted arrows in FIG. 3 show the line of action of the axial force component F. As described above, damage to the sealing ring 53 due to deformation or tilting of the sealing ring 53 under preload during assembly or in the final assembled state is avoided in this way.

[0067] The sealing ring 52 is implemented with two sealing lips 60 and 61 starting from the sealing waist 59 on the radial outside and is tightly pressed against the bearing outer ring 5 under preload. Here, the first dynamic sealing lip 60 arranged axially outside is pressed against the bearing outer ring 5 in the radial direction, and the second dynamic sealing lip 61 is pressed against the bearing outer ring 5 toward the axial inside. The third sealing lip 62 arranged axially inside forms a labyrinth seal with the bearing outer ring 5.

[0068] For other design solutions, refer to the previous Figure 1 and Figure 2 Description.

[0069] As a result, a reliable, low-friction, high-performance seal for sealing the rolling bearing 2 can be realized in a structurally simple manner through the proposed sealing component, which has a small structural width as a thin ring seal arranged on the bearing inner ring 7 by means of a tight fit. The high-performance seal can also seal relative to a fixed component via a sealing lip 56, preferably for sealing the bearing seat of the rolling bearing 2 in a housing.

[0070] Reference numerals list

[0071] 1 Sealing ring, thin ring seal

[0072] 2 Rolling bearings, thin ring bearings

[0073] 3 Sealing head

[0074] 4 Sealing seat, recess

[0075] 5 Bearing outer ring

[0076] 6 Sealed waist

[0077] 7 Bearing inner ring

[0078] 8 Bearing seat

[0079] 9 Fixed components, housings, pedal bearing housings

[0080] 10-axis, pedal crankshaft

[0081] 11 Bearing axis and rotation axis

[0082] 12 Rolling element cage

[0083] 13 Strengthening Department

[0084] 14 Cylindrical segments

[0085] 15 Shoulders

[0086] 16 End side

[0087] 17Mating surface, sealing surface

[0088] 18 Static sealing lip

[0089] 19 Axial sealing surface

[0090] 20 Protrusion

[0091] 21 Freespace

[0092] 22 Axial contact surface

[0093] 23 Axial mating surface

[0094] 24 Outer cone

[0095] 25 concave recesses

[0096] 26 First dynamic sealing lip

[0097] 27 Second dynamic sealing lip

[0098] 28 Static sealing lip

[0099] 29 Static sealing lip

[0100] 30 Static sealing lip

[0101] 31 Sealing surface, inner cone

[0102] 32 Free Space

[0103] 33 Free end

[0104] 34 Sealing surface, inner cone

[0105] 35 Axial sealing surface

[0106] 36 Free end

[0107] 37 Gap

[0108] 38 First contact surface

[0109] 39 Second contact surface

[0110] 40 unoccupied

[0111] 41 raised part, shaped part

[0112] 42 Concave and shaped parts

[0113] 43 Static sealing lip

[0114] 44 Sealing head

[0115] 45 Strengthening Department

[0116] 46 contact surface

[0117] 47 Protrusion

[0118] 48 contact area

[0119] 49 Adhesion area

[0120] 50 Axial sealing surface

[0121] 51 Free Space

[0122] 52 Sealing ring, thin ring seal

[0123] 53 Sealing head

[0124] 54 Shoulders

[0125] 55 Sealing seat

[0126] 56 Sealing lip

[0127] 57 unoccupied

[0128] 58 Protrusion

[0129] 59 Sealing lip

[0130] 60 Sealing lip

[0131] 61 Sealing lip

[0132] 62 Sealing lip

[0133] F axial force

[0134] D A Inner diameter of the protrusion of the sealing lip

[0135] D I Inner diameter of the projection at the bearing outer ring

[0136] D B Outer diameter of the protrusion of the sealing lip

[0137] D C The outer diameter of the shoulder at the bearing outer ring

Claims

1. A sealing assembly for sealing a rolling bearing (2) of a pedal support unit of a bicycle, in particular one that can be driven electrically, characterized in that: A sealing ring (1) is arranged in a sealing seat (4) with a sealing head (3, 44) in a tight fit for fixing, the sealing seat being set back radially outward at the inner diameter of the bearing outer ring (5), and at least one statically acting sealing lip (18, 28, 29, 30, 43) is arranged to seal the bearing seat (8) of the rolling bearing (2) at a fixed component (9), the sealing lip starting from the sealing head (3, 44) and the projection (20, 47) of the sealing lip at the inner diameter (D ) of the sealing head (3, 44). A ) is arranged radially outward above the shoulder (15) of the sealing seat (4), and the sealing lip is arranged in such a way that the axial component force (F) from the static contact of the sealing lip (18, 28, 29, 30, 43) can be introduced into the bearing outer ring (5) via the sealing head (3, 44) at the sealing seat (4) without torque.

2. The sealing assembly according to claim 1, characterized in that: The sealing ring (1) is designed as a thin-ring seal for sealing a rolling bearing (2) in the form of a thin-ring bearing.

3. The sealing assembly according to claim 1, characterized in that: The sealing lip (18, 28) extends conically tapering axially outward to abut against a sealing surface (19, 31) on the fixed component (9), wherein a free space (21, 32) is formed in the radial direction, into which the sealing lip (18) can expand or tilt when compressed by a preload force.

4. The sealing assembly according to any one of claims 1 to 3, characterized in that: The sealing lip (29) extends axially outwardly in a direction parallel to the axis of the bearing (11) and forms an inner cone widening toward the free end (33) as a sealing surface (34) at the inner diameter. The sealing lip can be in contact with an axial sealing surface (35) on the fixed component (9) in a tilted state under preload to achieve sealing.

5. The sealing assembly according to any one of claims 1 to 4, characterized in that: The sealing lip (30) engages with its free end (36) radially outwardly in a recess (37) at an axially outward end side (16) of the bearing outer ring (5), and can abut against the end side (16) of the bearing outer ring (5) with a first abutment surface (38) on one side under preload, and can abut against a mating surface (17) on a bearing seat (8) of the fixed component (9) with a second abutment surface (39) on the other side under preload for sealing.

6. The sealing assembly according to claim 5, characterized in that At least one of the contact surfaces (38) is designed in cross section as a wave-shaped configuration with a plurality of axial ridges (41) and recesses (42), so that in the preloaded state, expansion of the sealing lip (30) is accommodated in the recess (37) when the sealing lip is compressed under the preload force.

7. The sealing assembly according to any one of claims 1 to 6, characterized in that: The sealing lip (43) is connected to the sealing seat (4) at the sealing head (44) in such a way that the sealing lip forms an abutment area (49) on the sealing seat (4) toward the radial outside and delimits a free space (51) toward the radial inside, into which the sealing lip (43) can be accommodated in a folded or folded manner with its free end toward the radial inside in a state where it is prestressed for sealing and abuts against the fixed component (9).

8. The sealing assembly according to any one of claims 1 to 7, characterized in that: The sealing ring (1) is tightly abutted against the bearing inner ring (7) radially with a first dynamic sealing lip (26) on the radial inside and axially with a second dynamic sealing lip (27), and the sealing ring (1) forms a labyrinth seal with the bearing inner ring (7) with a third sealing lip (59).

9. A sealing assembly for sealing a rolling bearing of a pedal support unit of a bicycle, in particular one that can be driven electrically, characterized in that: The sealing ring (52) is arranged with a sealing head (53) in a tight fit in a sealing seat (55) for fixing, the sealing seat is set back radially inward at the outer diameter of the bearing inner ring (7), and at least one dynamically acting sealing lip (56) is arranged to abut against the fixed component, the sealing lip starting from the sealing head (53) and the outer diameter (D B ) is arranged radially inwardly below the shoulder (54) of the sealing seat (55) so that the axial component force (F) from the contact of the sealing lip (56) can be introduced into the bearing inner ring (7) via the sealing head (53) at the sealing seat (55) without torque.

10. Rolling bearing assembly for a pedal bearing unit of a bicycle, in particular one that can be driven electrically, comprising at least one rolling bearing (2) having a sealing assembly according to one of the preceding claims.

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