1. An air spring device comprising:
at least one air spring bellows made of an elastomeric material and having two ends, said bellows enclosing a variable-volume air chamber with formation of a loop;
a cover with a first connection region for one end of the bellows;
a rolling piston provided with a second connection region for the other end of the bellows and also with a rolling surface for the loop; and
a protective collar for the air spring bellows;
wherein the cover encloses a pot-shaped basic component and a separate connecting component with a first connection region for one end of the bellows, the basic component and the connecting component being in direct contact with one another;
a holder for the protective collar provided in a region of the cover, the holder being in direct contact with the connecting component; and
a common tightening ring, two ends of the common tightening ring being fastened to each other by a connection, the ring holding together, from the outside and in a sealing manner, the basic component, the connecting component, and the protective collar holder.
2. The air spring device as defined in claim 1, wherein the basic component andor the connecting component andor the holder for the protective collar are comprised of a plastic material.
3. The air spring device as defined in claim 2, wherein the plastic material is a high impact resistant polymer with high impact resistance.
4. The air spring device as defined in claim 3, wherein the high impact resistant polymer is polyamide or polyester.
5. The air spring device as defined in claim 2, wherein the plastic material is reinforced.
6. The air spring device as defined in claim 5, wherein the plastic material is reinforced with fabric or glass fibers.
7. The air spring device as defined in claim 1, wherein the basic component, the connecting component, and the holder for the protective collar are provided in the region of a clamping ring with flanged extensions, the clamping ring having a common outer surface that runs flush with an inside surface of the tightening ring.
8. The air spring device as defined in claim 7, wherein both the basic component and the holder for the protective collar have an undercut; and
prongs of the tightening ring enclose each undercut.
9. The air spring device as defined in claim 1, wherein a sealing ring made of a polymeric material is disposed between the basic component and the connecting component.
10. The air spring device as defined in claim 9, wherein the sealing ring consists of an elastomeric material or a thermoplastic elastomer.
11. The air spring device as defined in claim 7, wherein the ends of the clamping ring are linked by an interlocking connection.
12. The air spring device as defined in claim 7, wherein the ends of the clamping ring are connected by a welded connection.
13. The air spring device as defined in claim 7, wherein the ends of the clamping ring are connected by a clip connection, with a prong-shaped clip end engaging with openings which are arranged in a row.
14. The air spring device as defined in claim 7, wherein the ends of the clamping ring are connected by a rivet connection.
15. The air spring device as defined in claim 7, wherein the ends of the clamping ring are connected by a deformable, endless, closed connection overhang.
16. The air spring device as defined in claim 15, wherein the connection overhang is bent.
17. The air spring device as defined in claim 7, wherein the clamping ring consists of a metal.
18. The air spring device as defined in claim 1, wherein the connecting component and the first connecting region are made of a single part or of multiple parts, with an integrated elastomeric bearing.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An apparatus comprising:
a signal unit and
an evaluation unit which is or can be connected to said signal unit, for detecting quadrature signals of the signal unit, wherein the signal unit comprises a single power supply line and a ground line and during operation emitting at least two out of phase square signals for analysis in the analysis unit, wherein the signal unit is operable to apply the two out of phase square signals at different amplitudes to the single power supply line, both square signals being modulated onto the supply current supplied by way of the power supply line, and wherein the analysis unit comprises a comparator, one input of which is or can be connected to the single power supply line, while a predetermined threshold value is applied to the other input.
2. The apparatus according to claim 1, wherein the two square signals are applied by way of mutually different resistors to the common power supply line.
3. The apparatus according to claim 1, wherein the threshold value has a level between the two amplitudes of the two square signals plus the amplitude of the supply current.
4. The apparatus according to claim 1, wherein the output of the comparator is connected to an input of a logic unit, which is connected at a further input to the power supply line to supply the square signals modulated onto the supply current.
5. The apparatus according to claim 4, wherein the logic unit is set up to analyze the modulated square signals at least one of rising and falling edges of the comparator output signal by comparison with predetermined values.
6. The apparatus according to claim 1, wherein the signal unit is a sensor unit with at least two sensors.
7. According to claim 6, wherein the sensors are position sensors of an electric motor.
8. The apparatus according to claim 1, wherein the signals per se are applied to the common supply current line.
9. The apparatus according to claim 1, wherein the signal unit comprises a logic module, which is set up to derive signals formed by linking the original signals, the square signals being modulated onto the supply current according to these derived signals.
10. The apparatus according to claim 9, wherein the signals formed by linking the original signals are speed and rotational direction signals formed from position sensor output signals.
11. An method for detecting quadrature signals of a signal unit comprising a single power supply line and a ground line, the method comprising the steps of:
emitting at least two out of phase square signals for analysis in an analysis unit,
applying the two out of phase square signals at different amplitudes to the single power supply line, both square signals being modulated onto the supply current supplied by way of the power supply line, and
comparing the signal on the single power supply line with a predetermined threshold value.
12. The method according to claim 11, wherein the two square signals are applied by way of mutually different resistors to the common power supply line.
13. The method according to claim 11, wherein the threshold value has a level between the two amplitudes of the two square signals plus the amplitude of the supply current.
14. The method according to claim 11, comprising the steps of connecting an output of a comparator to an input of a logic unit, which is connected at a further input to the power supply line to supply the square signals modulated onto the supply current.
15. The method according to claim 14, comprising the step of analyzing the modulated square signals at least one of rising and falling edges of the comparator output signal by comparison with predetermined values.
16. The method according to claim 11, wherein the signal unit is a sensor unit with at least two sensors.
17. The method according to claim 16, wherein the sensors are position sensors of an electric motor.
18. The method according to claim 11, wherein the signals per se are applied to the common supply current line.
19. The method according to claim 11, comprising the step of deriving signals formed by linking the original signals, wherein the square signals are modulated onto the supply current according to these derived signals.
20. The method according to claim 19, wherein the signals formed by linking the original signals are speed and rotational direction signals formed from position sensor output signals.