Abstract
A rim system including a rim, an adapter disc for mounting on a wheel hub of a vehicle, a plurality of wheel screws or a plurality of wheel nuts for fastening the rim to the adapter disc, a plurality of screws or a plurality of nuts for fastening the adapter disc to the wheel hub and a wheel hub centring ring for centring the adapter disc relative to the wheel hub. A rim centring ring is provided for centring the rim relative to the adapter disc.
Claims
1. A rim system comprising a rim, an adapter disc for mounting on a wheel hub of a vehicle, comprising a plurality of wheel screws or a plurality of wheel nuts for fastening the rim to the adapter disc, a plurality of screws or a plurality of nuts for fastening the adapter disc to the wheel hub and a wheel hub centring ring for centring the adapter disc relative to the wheel hub, wherein a rim centring ring is provided for centring the rim relative to the adapter disc.
2. The rim system according to claim 1, wherein the rim centring ring consists of plastics.
3. The rim system according to claim 1, wherein a centring surface of the rim centring ring has a plurality of nubs or projections.
4. The rim system according to claim 1, wherein a centring surface of the rim centring ring is configured to be slightly conical.
5. The rim system according to claim 1, wherein the rim centring ring is fastened by latching means to the rim.
6. The rim system according to claim 5, wherein the rim centring ring has at least two latching lugs and the rim has a circumferential groove in a central opening, wherein the at least two latching lugs are provided for latching into the circumferential groove.
7. The rim system according to claim 1, wherein a centring surface of the rim centring ring is configured to cooperate with an inner circumference of a central opening of the adapter disc.
8. The rim system according to claim 1, wherein that the adapter disc has a plurality of threaded bushes for screwing in the wheel screws, or a plurality of screw bolt inserts for screwing on the wheel nuts.
9. The rim system according to claim 1, wherein the adapter disc has at least one projection on its surface facing the rim, wherein the projection is provided for engaging in a suitable recess in the rim.
10. The rim system according to claim 8, wherein the threaded bushes have a collar which protrudes beyond the surface of the adapter disc facing the rim, wherein the collar forms the projection for engaging in a suitable recess of the rim.
11. The rim system according to claim 1, wherein wheel hub centring ring has a centring surface which is configured to cooperate with an outer circumference of the wheel hub.
12. The rim system according to claim 11, wherein the centring surface of the wheel hub centring ring has a plurality of nubs or projections.
13. The rim system according to claim 11, wherein the centring surface of the wheel hub centring ring is slightly conical.
14. The rim system according to claim 1, wherein the wheel hub centring ring has latching means for fastening the wheel hub centring ring to the adapter disc.
15. The rim system according to claim 1, wherein a set comprising a plurality of adapter discs is provided, wherein the adapter discs of the set have different thicknesses and/or different pitch circles for connecting to the wheel hub.
16. The rim system according to claim 1, wherein a set comprising a plurality of wheel hub centring rings is provided, wherein the wheel hub centring rigs of the set have different diameters of the centring surface.
17. The rim system according to claim 1, wherein a set comprising a plurality of rim centring rings is provided, wherein the rim centring rings of the set are configured to centre differently configured rims.
18. An arrangement comprising a rim system according to claim 1 and a wheel hub of a vehicle, wherein the adapter disc is fastened to the wheel hub by a plurality of screws or a plurality of nuts, wherein a wheel hub centring ring is provided for centring the adapter disc relative to the wheel hub, wherein the rim is fastened to the adapter disc by a plurality of wheel screws or a plurality of wheel nuts, and wherein a rim centring ring is provided for centring the rim relative to the adapter disc.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0040] In the drawings:
[0041] FIG. 1 shows an exploded view of an arrangement according to the invention comprising a rim system according to the invention;
[0042] FIG. 2 shows a sectional view of the rim system of FIG. 1 in a further exploded view;
[0043] FIG. 3 shows a sectional view of the rim of the rim system of FIG. 1, in some portions;
[0044] FIG. 4 shows the rim centring ring of the rim system of FIG. 1;
[0045] FIG. 5 shows the adapter disc of the rim system of FIG. 1 mounted on a wheel hub;
[0046] FIG. 6 shows a sectional view of the adapter disc of the rim system of FIG. 1;
[0047] FIG. 7 shows a threaded bush of the adapter disc of the rim system of FIG. 1;
[0048] FIG. 8 shows a wheel hub centring ring of the rim system of FIG. 1;
[0049] FIG. 9 shows a sectional view of an arrangement comprising the rim system of FIG. 1 in the mounted state;
[0050] FIG. 10 shows an enlargement of the sectional view of FIG. 9, in some portions;
[0051] FIG. 11 shows a plurality of different adapter discs of the rim system according to the invention; and
[0052] FIG. 12 shows a plurality of different wheel hub centring rings of the rim system according to the invention.
DETAILED DESCRIPTION
[0053] FIG. 1 shows an arrangement comprising a rim system 10 according to the invention, comprising a rim 12 and an adapter disc 14 which is provided for mounting on a wheel hub 16. A total of five wheel screws 18 are provided for fastening the rim 12 to the adapter disc 14. A total of five screws 20 are provided for fastening the adapter disc 14 in the threaded bores of the wheel hub 16. A wheel hub centring ring 22 is provided for centring the adapter disc 14 relative to the wheel hub 16. A rim centring ring 24 is provided for centring the rim 12 relative to the adapter disc 14. A brake disc 26 is provided on the wheel hub 16, said brake disc being able to be dispensed with within the scope of the invention, or for example even being replaced by a brake drum. The brake disc 26 in the view of FIG. 1 covers the threaded bores of the wheel hub 16.
[0054] For mounting the rim system 10 on the wheel hub 16 initially the wheel hub centring ring 22 is latched into the central opening of the adapter disc 14. The adapter disc 14 is then pushed onto the wheel hub 16. At the same time the wheel hub centring ring 22 is arranged between the outer circumference of the wheel hub 16 and the adapter disc 14 and thereby ensures an accurate centring of the adapter disc 14 relative to the wheel hub 16. The adapter disc 14 is fastened in this centred state by means of the screw 20 to the wheel hub. To this end, the screws 20 are inserted through through-openings 28 in the brake disc 26 and then screwed into threaded bores of the wheel hub 16 which are concealed in FIG. 1. After fastening the adapter disc, the rim 12 is arranged on the adapter disc 14, wherein a rim centring ring 24 is fastened to the rim 12 and inserted into a central opening of the adapter disc 14 in order to centre the rim 12 relative to the adapter disc 14, and the rim 12 is then fastened by means of the wheel screws 18 to the adapter disc 14. The adapter disc 14 is provided with a total of five threaded bushes 30 into which the wheel screws 18 may be screwed. The threaded bushes 30 have a circumferential collar which protrudes beyond the surface of the adapter disc 14 which faces the rim 12. The threaded bushes 30 engage with the collar thereof in recesses of the rim on the side of the rim facing the adapter disc 14, wherein these recesses may not be identified in FIG. 1. The rim may be positioned thereby in the rotational direction in a very simple manner relative to the adapter disc. The collar of the threaded bushes 30 also ensures, in cooperation with the recesses in the rim 12, a reliable torque transmission between the rim 12 and the adapter disc 14. The adapter disc 14 is connected fixedly in terms of rotation to the wheel hub 16 by the screws 20.
[0055] The rim centring ring 24 is clipped into a central opening of the rim 12 which is concealed in FIG. 1. The rim centring ring 24 acts with a centring surface 34 on the inner circumference 36 of the central opening of the adapter disc 14 and ensures an accurate centring of the rim 12 relative to the adapter disc 14. Since the adapter disc 14 is already accurately centred relative to the outer circumference of the wheel hub 16 by means of the wheel hub centring ring 22, the rim centring ring 24 is able to ensure that the rim 12 is accurately centred relative to the wheel hub 16. After the centring surface 34 bears against the adapter disc 14 and the rim 12 is accurately centred relative to the adapter disc 14, the wheel screws 18 are screwed into the threaded bushes 30 in order to fasten the rim 12 securely to the adapter disc 14 and thereby indirectly also to the wheel hub 16.
[0056] The rim system 10 according to the invention has considerable advantages relative to conventional rims, since by means of the adapter disc 14 and the wheel hub centring ring 22 it is possible to carry out an adaptation to different outer circumferences and pitch circles of the wheel hubs 16. Vehicles from different manufacturers and also different vehicles from one and the same manufacturer may have different wheel hubs 16. In this case, these differences relate not only to the pitch circle, i.e. the circle radius on which the threaded bores are arranged in the wheel hub 16, but also the outer circumference of the wheel hub 16 which serves for centring the adapter disc 14 or for centring the rims. As a result, the rim system 10 according to the invention may be used in an exceptionally flexible manner and the rim 12 may be fastened by means of different adapter discs 14 and different wheel hub centring rings 22 to wheel hubs 16 having a different pitch circle and a different outer circumference of a centring surface of the wheel hub 16.
[0057] Moreover, the rim centring ring 24 also serves for an accurate centring of the rim 12 relative to the adapter disc 14. Thus the problem of conventional rim systems is solved, namely that a centring of the rim 12 relative to the adapter disc 14 and thus ultimately relative to the wheel hub 16 may not be undertaken in a sufficiently accurate manner. As may be already identified in FIG. 1, the centring surface 34 of the rim centring ring 24 acts on the inner circumference 36 of the central bore of the adapter disc 14. As a result, space is saved and the two surfaces of the adapter disc 14 may be used entirely for arranging the threaded bushes 30 and for arranging the heads of the screws 20.
[0058] The provision of threaded bushes 30 in the adapter disc 14 makes it possible to produce the adapter disc 14 itself from a very lightweight material, for example aluminium or an aluminium alloy. The threaded bushes 30 may be manufactured from steel or another high-strength lightweight material, for example titanium, and pressed into the adapter disc 14. The screws 20 and the wheel screws 18 may also be manufactured from very lightweight and high-strength material, for example titanium. A very stable connection between the rim 12 and the wheel hub 16 may be provided thereby and at the same time the unsprung masses may be reduced on the wheel suspension of a vehicle.
[0059] FIG. 2 shows a sectional view of the arrangement of FIG. 1 in an exploded view and from a slightly different viewing angle. In this view, the construction of the wheel hub 16 may be identified more accurately. The wheel hub 16 has a central bore with an internal toothing 40. The internal toothing 40 may be pushed onto an external toothing of a drive shaft, not shown, for example a half shaft which originates from the differential. The internal toothing 40 may naturally also be connected to the output shaft of an electric motor. In the context of the invention, the central bore of the wheel hub and the internal toothing 14 may naturally also be dispensed with, for example when a non-driven wheel is present. The wheel hub 16 has an annular projection 42, the outer circumference 44 thereof comprising a centring surface for a conventional rim or for an adapter disc 14 of the rim system 10 according to the invention. In FIG. 2 one of the threaded bores 46 of the wheel hub 16 may also be identified, the screws 20 which then fasten the adapter disc 14 to the wheel hub 16 being able to be screwed therein.
[0060] Instead of the screws 20 and the threaded bores 46, the wheel hub 16 may also have screw bolts, the adapter disc 14 being pushed thereon and then being fastened by suitable nuts to the wheel hub 16.
[0061] In the context of the invention, instead of the threaded bushes 30, the adapter disc 14 in turn may also be provided with screw bolts which are then inserted through through-openings of the rim 12, so that rather than being fastened by means of the wheel screws 18 the rim 12 is then fastened by suitable nuts to the screw bolts of the adapter disc 14.
[0062] In FIG. 2 it is possible to identify an internal centring surface of the wheel hub centring ring 22 on the adapter disc 14. The wheel hub centring ring 22 in the view in FIG. 2 is already latched into the central opening of the adapter disc 14. The centring surface of the wheel hub centring ring 22 is configured to be slightly conical and opens in the direction of the wheel hub 16. Moreover, the centring surface is provided with a plurality of strip-like projections 48, only two thereof being able to be identified in FIG. 2. These projections 48 protrude slightly beyond the centring surface and are provided for compensating for tolerances of the outer circumference 44 of the wheel hub 16. If the outer circumference 44 is larger than the target dimension, when the wheel hub centring ring 22 is pushed on together with the adapter disc 14, the projections 48 are compressed and, if required, plastically deformed. As a result, a seat of the adapter disc 14 on the outer circumference 44 of the wheel hub 16 is achieved without clearance. If the outer circumference 44 of the wheel hub 16 is at the target dimension or possibly slightly smaller than the target dimension, only the projections 48 bear against the outer circumference 44 and thereby still ensure a centring of the adapter disc 14 relative to the wheel hub 16 without clearance.
[0063] In the view of FIG. 2 the rim centring ring 24 is also shown in a position in which it is latched into the central bore of the rim 12. The centring surface 34 of the rim centring ring 24 protrudes in the direction of the adapter disc 14. When positioning the rim 12 onto the adapter disc 14, the centring surface 34 of the rim centring ring 24 comes into abutment with the inner circumference of the central bore of the adapter disc 14 and is able to ensure thereby an accurate centring of the rim 12 relative to the adapter disc 14. The centring surface 34 is also provided with strip-like projections which may not be identified in FIG. 2, and which may ensure a centring of the rim 12 relative to the adapter disc 14 without clearance, even if the central bore of the adapter disc 14 is subject to tolerances. The centring surface 34 is configured to be slightly conical and tapers in the direction of the adapter disc 14 starting from the rim 12. As a result, the centring surface 34 of the rim centring ring 24 may be inserted in a very simple manner into the central opening of the adapter disc 14.
[0064] The view in FIG. 3 shows a sectional view of the rim 12 with the rim centring ring 24, which is enlarged in some portions. It is possible to identify the external centring surface 34 of the rim centring ring 24. The conical configuration of the centring surface 34 may not be identified in FIG. 3, since it is configured to be very slight and the centring surface 34, when viewed away from the rim 12, tapers by only a few tenths of a millimetre, for example 1/10 mm to 2/10 mm. In the context of the invention, the centring surface 34 does not necessarily have to be configured to be conical.
[0065] The rim centring ring 24 has on its end inserted into the central opening 50 of the rim 12 a circumferential collar with a total of four latching lugs 52, in FIG. 3 only three thereof being able to be identified. These latching lugs 52 snap into a circumferential groove 54 in the central opening 50 of the rim 12 and thereby secure the rim centring ring 24 in the central opening 50 without clearance.
[0066] The rim centring ring 24 is advantageously produced from plastics. In this case, fibre-reinforced plastics may be selected. Advantageously, the rim centring ring is produced as a plastics injection-moulded part.
[0067] The wheel hub centring ring 22 is also advantageously produced as a plastics part, in particular a plastics injection-moulded part.
[0068] FIG. 4 shows the rim centring ring 24 in a view obliquely from the front. It is possible to identify the circumferential centring surface 34 which is provided with a plurality of strip-like projections 56 running in the axial direction. The strip-like projections 56, as described above, serve to centre the rim 12 relative to the adapter disc 14 without clearance. If the central opening of the adapter disc 14 has a smaller diameter than the target diameter, the strip-like projections 56 are compressed and, if required, plastically deformed. If the central opening of the adapter disc 14 has its target diameter or even a diameter which is slightly larger than the target diameter, the projections 56 bear against the inner circumference of the central opening and ensure thereby a centring of the rim 12 relative to the adapter disc 14 without clearance.
[0069] The latching lugs 52 of the rim centring ring 24 which are arranged on resilient latching arms are also able to be clearly identified in FIG. 4. The rim centring ring 24 is designed in one piece and when inserted into the central opening 50 of the rim 12, see FIG. 3, the latching lugs 52 are initially deflected radially inwardly until they have reached the level of the circumferential groove 54 in the central opening 50 of the rim 12. Then the latching lugs 52 snap outwardly and engage in the circumferential groove 54. The rim centring ring 24 is then secured thereby to the rim 12.
[0070] FIG. 5 shows an enlarged view of the wheel hub 16 with the adapter disc 14 fastened thereto. In this view it may be identified how the wheel hub centring ring 22 is arranged between the inner circumference of the central opening of the adapter disc 14 and the outer circumference 44 of the wheel hub 16, and thereby ensures a centring of the adapter disc 14 relative to the wheel hub 16 without clearance.
[0071] FIG. 6 shows a sectional view of the adapter disc 14. Threaded bushes 30 are pressed into suitably configured through-openings of the adapter disc 14, the wheel screws 18 being able to be screwed into said threaded bushes. The threaded bushes 30 are pressed fixedly in terms of rotation into the adapter disc 14.
[0072] The adapter disc 14 has through-openings 58 for inserting the screws 20. The through-openings have a conical bearing portion and a cylindrical through-portion. The screws 20 have a conical bearing collar which is located in the conical portion of the through-openings 58.
[0073] The wheel hub centring ring 22 is inserted into the central opening of the adapter disc 14 and latched by means of a plurality of latching lugs in a circumferential groove 60 in the central opening of the adapter disc 14. The centring surface of the wheel hub centring ring 22 is located inside the central opening of the adapter disc 14. As a result, an exceptionally space-saving arrangement is achieved. In FIG. 6 it is possible to identify the projections 48 on the centring surface of the wheel hub centring ring 22.
[0074] It may be identified in FIG. 6 that the wheel hub centring ring 22 firstly does not protrude beyond the surface of the adapter disc 14, which is arranged to the right in FIG. 6, and secondly protrudes therein only up to slightly more than half of the axial length of the central opening of the adapter disc 14. Starting from the surface of the adapter disc 14, which is shown to the left in FIG. 6 and which faces the rim in the mounted state, a portion of the inner circumference of the central opening of the adapter disc 14 is still free and free space 62 is still present radially inside the inner circumference of the central opening, into which the rim centring ring 24 may then be inserted in some portions. Specifically, the centring surface 34 of the rim centring ring 24 is inserted into this free space 62 and then bears against the inner circumference of the central opening of the adapter disc 14. In the axial direction an exceptionally space-saving arrangement is achieved thereby.
[0075] FIG. 7 shows the threaded bushes 30 which are pressed into the adapter disc 14, see FIG. 6. The threaded bush 30 has a circumferential toothing 64, wherein the individual teeth of the toothing 64 run in the axial direction. The threaded bush 30 may be pressed thereby in the axial direction into a suitable through-opening of the adapter disc 14. The threaded bush 30 then sits fixedly in terms of rotation in the adapter disc 14. The threaded bush 30 may be produced from steel, but for example also from titanium, in order to be configured to be high-strength, on the one hand, and to be very lightweight, on the other hand.
[0076] FIG. 8 shows the wheel hub centring ring 22 obliquely from the front. It is possible to identify the latching lugs on the wheel hub centring ring 22 and a plurality of projections 48 on the centring surface of the wheel hub centring ring 22 which is then pushed onto the outer circumference 44 of the wheel hub 16.
[0077] FIG. 9 shows a sectional view of an arrangement with the rim system 10 according to the invention of FIG. 1 and the wheel hub 16. The cutting plane, on the one hand, passes through one of the wheel screws 18 by which the rim 12 is fastened to the adapter disc 14. The cutting plane also runs through one of the screws 20 which engage in threaded bores 46 of the wheel hub 16 for fastening the adapter disc 14.
[0078] In FIG. 9 it may also be identified how the collar of the threaded bush 30, which protrudes beyond the surface of the adapter disc 14 facing the rim 12, engages in a suitable recess in the rim 12. As a result, the rim 12 firstly may be accurately prepositioned when positioned on the adapter disc 14, so that the wheel screws 18 may be easily screwed in. Moreover, via this protruding collar, torque may also be transmitted from the rim 12 to the adapter disc 14 and ultimately to the wheel hub 16 or vice-versa. With very high-torque vehicles this engagement of the collar of the threaded bush 30 into a suitable recess of the rim 12 ensures a secure and torque-resistant fastening of the rim 12 to the adapter disc 14 and thereby the wheel hub 16.
[0079] FIG. 10 shows an enlarged detail of the view of FIG. 9. In this view it may be clearly identified that the centring surface 34 of the rim centring ring 24 bears without clearance against the inner circumference of the central opening of the adapter disc 14 and thereby ensures an accurate centring of the rim 12 relative to the adapter disc 14 without clearance.
[0080] It may be further identified in FIG. 10 that the wheel hub centring ring 22 ensures a centring of the adapter disc 14 relative to the outer circumference 44 of the wheel hub 16 without clearance. By means of the rim system 10 according to the invention, the rim 12 is thus centred relative to the wheel hub 16 without clearance.
[0081] It may be further identified in FIG. 10 how the circumferential collar of the threaded bush 30 engages in the suitable recess of the rim 12.
[0082] FIG. 11 shows a set comprising a plurality of adapter discs 14 of the rim system according to the invention. The different adapter discs 14 have different thicknesses and are able to implement thereby different wheel offsets or different track widths when the rim 12 is mounted with different adapter discs 14 on the wheel hub 16.
[0083] Moreover, the adapter discs 14 may have different pitch circles of the through-openings 58, the screws 20 being inserted therethrough in order to connect the adapter disc 14 to the wheel hub 16. The through-openings 58 may also be configured as slots, in particular curved slots, if required.
[0084] FIG. 12 shows a set of different wheel hub centring rings 22 of the rim system according to the invention. The rim centring rings 22 have in each case a different inner circumference of the centring surfaces thereof, in order to be mounted on differently configured wheel hubs 16. By means of the different wheel hub centring rings 22 of the set shown in FIG. 12, therefore, the adapter disc 14 may be adapted to very different wheel hub external diameters.
