1. Spur gear wheel with a gear body made from a sintered material, having a circumference around which teeth projecting in the radial direction are distributed, and which is delimited in the axial direction by two end faces, and at least one shaped element in the form of a compacted recess or a compacted elevation is disposed in or on the end faces, the compacted recess being formed in the end face or the compacted elevation projecting above the end face, wherein the at least one shaped element at least approximately imitates the contour of the toothing, wherein in the region of the tooth crests and tooth flanks and in the region of the root line a land is formed on the end face and the end face is visible in these regions in that the at least one shaped element is spaced from an outer circumference of the teeth, the at least one shaped element having a density greater than a density of the outer circumference of the teeth, wherein the at least one shaped element extends in the radial direction at most as far as a region underneath the root line of the teeth consisting of 35% of the maximum diameter of the gear body, and wherein the at least one shaped element covers at least 5% of the surface portion of the teeth on the end face.
2. Spur gear wheel according to claim 1, wherein the at least one shaped element extends along the external contour of the end face.
3. Spur gear wheel according to claim 1, wherein the at least one shaped element extends starting at least approximately from the tooth crest circle inwardly in the radial direction.
4. Spur gear wheel according to claim 3, wherein the at least one shaped element is additionally disposed extending in the axial direction on the tooth crests andor tooth roots.
5. Spur gear wheel according to claim 1, wherein the at least one shaped element extends starting at least approximately from the tooth root line inwardly in the radial direction.
6. Spur gear wheel according to claim 1, wherein a contour of the at least one shaped element is provided with rounded areas at least in the region of a change of direction in the contour line.
7. Spur gear wheel according to claim 1, wherein the at least one shaped element has an approximately mushroom-shaped cross-section as viewed in the axial direction.
8. Spur gear wheel according to claim 1, wherein the at least one shaped element has an approximately circular or oval cross-section as viewed in the axial direction.
9. Spur gear wheel according to claim 1, wherein a transition between the at least one shaped element and the end face is of an angled or rounded design.
10. Spur gear wheel according to claim 1, wherein the toothing is of a non-uniform design and the tooth geometry andor tooth strength of at least one of the individual ones of the teeth differs from the tooth geometry andor tooth strength of the rest of the teeth, and wherein the non-uniformities are disposed in an a-periodic arrangement.
11. Spur gear wheel according to claim 10, wherein the tooth geometry andor tooth strength of at least individual teeth varies from the tooth geometry andor tooth strength of the rest of the teeth.
12. Spur gear wheel according to claim 10, wherein at least individual ones of the tooth gap depths are bigger or smaller than the tooth gap depths of the rest of the tooth gaps.
13. Spur gear wheel according to claim 10, wherein a tooth height varies in the range of between 10% and 20% of the tooth height of the tooth with the greatest tooth height.
14. Spur gear wheel according to claim 10, wherein the tooth gap depths vary in the range of between 5% and 15% of the tooth gap depth of the tooth with the deepest tooth gap.
15. Spur gear wheel according to claim 10, wherein the tooth width varies in the circumferential direction in the range of between 50% and 100% of the tooth width of the tooth with the greatest tooth width.
16. Spur gear wheel according to claim 10, wherein the tooth stiffness varies in the range of between 50% and 90% of the tooth stiffness of the tooth with the greatest tooth stiffness.
17. Spur gear wheel according to claim 10, wherein the teeth are distributed around the circumference with a differing pitch.
18. Spur gear wheel according to claim 10, wherein the tooth height of at least one tooth varies from the end face in the direction towards the second end face, in particular a tooth crest with a conical aspect is provided in the axial direction.
19. Spur gear wheel according to claim 10, wherein the tooth width of at least one tooth varies in at least certain regions from the end face in the direction towards the second end face, in particular a tooth flank is provided in the region of the tooth crest with a conical aspect in the axial direction.
20. Spur gear wheel according to claim 10, wherein the gear body comprises at least three layers in the radial direction, with two peripheral layers and a middle layer, and wherein the middle layer has a lower hardness than the two peripheral layers.
21. Spur gear wheel according to claim 20, wherein the middle layer is made from a plastic.
22. Spur gear wheel according to claim 20, wherein the plastic is a thermosetting plastic.
23. Spur gear wheel according to claim 20, wherein the middle layer has a value for the layer thickness selected from a range with a lower limit of 5% and an upper limit of 700% of the layer thickness of the radially outermost peripheral layer.
24. Spur gear wheel according to claim 20, wherein the teeth have a hardness of at most 750 HV5.
25. Spur gear wheel according to claim 24, wherein the teeth have a height whose value is selected from a range with a lower limit of 1% and an upper limit of 50% of the maximum gear diameter.
26. Spur gear wheel according to claim 24, wherein the teeth have a width whose value is selected from a range with a lower limit of 1% and an upper limit of 50% of the maximum gear diameter.
27. Spur gear wheel according to claim 1, wherein the at least one shaped element is additionally disposed on at least one of the end faces.
28. Spur gear wheel according to claim 27, wherein the compacted area has a density of at least 7.2 gcm3, at least in the region of the end face.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A communication system in which communication is performed between a stationary terminal and a mobile terminal under an OFDM system, the communication system comprising:
a transmitter in the mobile terminal for transmitting a control signal and a data signal; and
a receiver in the stationary terminal for receiving the control signal and the data signal transmitted from the mobile terminal, wherein:
the control signal includes a signal indicating a number of sub-carriers used in transmitting the data signal; and
the number of sub-carriers is determined according to a moving speed of the mobile terminal so that the number of the sub-carriers is reduced in accordance with increase of the moving speed.
2. The communication system as in claim 1, wherein:
a transmission rate of the data signal is reduced in accordance with increase of the moving speed.
3. The communication system as in claim 1, wherein:
a transmission rate of the data signal is kept constant irrespective of the moving speed.
4. A communication system in which communication is performed between a stationary terminal and a mobile terminal under an OFDM system, the communication system comprising:
a transmitter in the mobile terminal for transmitting a control signal and a data signal; and
a receiver in the stationary terminal for receiving the control signal and the data signal transmitted from the mobile terminal, wherein:
the control signal includes a signal indicating a sub-carrier modulation formula used in transmitting the data signal; and
the sub-carrier modulation formula is determined according to a moving speed of the mobile terminal so that the sub-carrier modulation formula having a higher error-robustness is used in accordance with increase of the moving speed.
5. The communication system as in claim 4, wherein:
a transmission rate of the data signal is reduced in accordance with increase of the moving speed.
6. A communication system in which communication is performed between a stationary terminal and a mobile terminal under an OFDM system, the communication system comprising:
a transmitter in the mobile terminal for transmitting a control signal and a data signal; and
a receiver in the stationary terminal for receiving the control signal and the data signal transmitted from the mobile terminal, wherein:
the control signal includes a signal representing a error-correction-code coding rate used in transmitting the data signal; and
the error-correction-code coding rate is determined according to a moving speed of the mobile terminal so that the error-correction-code coding rate having a higher error-correction ability is used in accordance with increase of the moving speed.
7. The communication system as in claim 6, wherein:
a transmission rate of the data signal is reduced in accordance with increase of the moving speed.
8. The mobile terminal for use in the communication system defined in claim 1, the mobile terminal comprising:
a transmitter-receiver for communicating with the stationary terminal;
a speed sensor for detecting the moving speed of the mobile terminal; and
a controller for determining the number of sub-carriers according to the detected moving speed, for instructing the transmitter-receiver to notify the number of sub-carriers to the stationary terminal, and for controlling the transmitter-receiver based on the number of sub-carriers.
9. The mobile terminal for use in the communication system defined in claim 2, the mobile terminal comprising:
a transmitter-receiver for communicating with the stationary terminal;
a speed sensor for detecting the moving speed of the mobile terminal; and
a controller for determining the number of sub-carriers and the transmission rate according to the detected moving speed, for instructing the transmitter-receiver to notify the number of sub-carriers and the transmission rate to the stationary terminal, and for controlling the transmitter-receiver based on the number of sub-carriers and the transmission rate.
10. The mobile terminal for use in the communication system defined in claim 3, the mobile terminal comprising:
a transmitter-receiver for communicating with the stationary terminal;
a speed sensor for detecting the moving speed of the mobile terminal; and
a controller for determining the number of sub-carriers according to the detected moving speed while maintaining the transmission rate constant, for instructing the transmitter-receiver to notify the number of sub-carriers and the transmission rate to the stationary terminal, and for controlling the transmitter-receiver based on the number of sub-carriers and the transmission rate.
11. The mobile terminal for use in the communication system defined in claim 4, the mobile terminal comprising:
a transmitter-receiver for communicating with the stationary terminal;
a speed sensor for detecting the moving speed of the mobile terminal; and
a controller for determining the modulation formula according to the detected moving speed, for instructing the transmitter-receiver to notify the modulation formula to the stationary terminal, and for controlling the transmitter-receiver based on the modulation formula.
12. The mobile terminal for use in the communication system defined in claim 5, the mobile terminal comprising:
a transmitter-receiver for communicating with the stationary terminal;
a speed sensor for detecting the moving speed of the mobile terminal; and
a controller for determining the modulation formula and the transmission rate according to the detected moving speed, for instructing the transmitter-receiver to notify the modulation formula and the transmission rate to the stationary terminal, and for controlling the transmitter-receiver based on the modulation formula and the transmission rate.
13. The mobile terminal for use in the communication system defined in claim 6, the mobile terminal comprising:
a transmitter-receiver for communicating with the stationary terminal;
a speed sensor for detecting the moving speed of the mobile terminal; and
a controller for determining the error-correction-code coding rate according to the detected moving speed, for instructing the transmitter-receiver to notify the error-correction-code coding rate to the stationary terminal, and for controlling the transmitter-receiver based on the error-correction-code coding rate.
14. The mobile terminal for use in the communication system defined in claim 7, the mobile terminal comprising:
a transmitter-receiver for communicating with the stationary terminal;
a speed sensor for detecting the moving speed of the mobile terminal; and
a controller for determining the error-correction-code coding rate and the transmission rate according to the detected moving speed, for instructing the transmitter-receiver to notify the error-correction-code coding rate and the transmission rate to the stationary terminal, and for controlling the transmitter-receiver based on the error-correction-code coding rate and the transmission rate.
15. The mobile terminal as in any one of claims 8-14, wherein:
the mobile terminal further includes a wireless communication device for making notification to the stationary terminal in place of the transmitter-receiver according to the instruction from the controller.
16. The stationary terminal for use in communication with the mobile terminal defined in claim 8, the stationary terminal comprising:
transmitter-receiver means for performing communication with the mobile terminal; and
means for controlling the transmitter-receiver means based on the number of sub-carriers notified from the mobile terminal.
17. The stationary terminal for use in communication with the mobile terminal defined in claim 9, the stationary terminal comprising:
transmitter-receiver means for performing communication with the mobile terminal; and
means for controlling the transmitter-receiver means based on the number of sub-carriers and the transmission rate notified from the mobile terminal.
18. The stationary terminal for use in communication with the mobile terminal defined in claim 10, the stationary terminal comprising:
transmitter-receiver means for performing communication with the mobile terminal; and
means for controlling the transmitter-receiver means based on the number of sub-carriers notified from the mobile terminal.
19. The stationary terminal for use in communication with the mobile terminal defined in claim 11, the stationary terminal comprising:
transmitter-receiver means for performing communication with the mobile terminal; and
means for controlling the transmitter-receiver means based on the modulation formula notified from the mobile terminal.
20. The stationary terminal for use in communication with the mobile terminal defined in claim 12, the stationary terminal comprising:
transmitter-receiver means for performing communication with the mobile terminal; and
means for controlling the transmitter-receiver means based on the modulation formula and the transmission rate notified from the mobile terminal.
21. The stationary terminal for use in communication with the mobile terminal defined in claim 13, the stationary terminal comprising:
transmitter-receiver means for performing communication with the mobile terminal; and
means for controlling the transmitter-receiver means based on the error-correction-code coding rate notified from the mobile terminal.
22. The stationary terminal for use in communication with the mobile terminal defined in claim 14, the stationary terminal comprising:
transmitter-receiver means for performing communication with the mobile terminal; and
means for controlling the transmitter-receiver means based on the error-correction-code coding rate and the transmission rate notified from the mobile terminal.
23. The mobile terminal for use in the communication system defined in claim 1, the mobile terminal comprising:
a transmitter-receiver for communicating with the stationary terminal;
a speed sensor for detecting the moving speed of the mobile terminal; and
a controller for determining the number of sub-carriers according to the detected moving speed, and for controlling the transmitter-receiver based on the number of sub-carriers.
24. The stationary terminal for use in communication with the mobile terminal defined in claim 23, the stationary terminal comprising:
transmitter-receiver means for performing communication with the mobile terminal;
means for determining the number of sub-carriers based on the data signal received from the mobile terminal; and
means for controlling the transmitter-receiver means based on the number of sub-carriers determined by the determining means.
25. A communication system in which communication is performed between a stationary terminal and a mobile terminal under an OFDM system, the communication system is characterized in that the communication is performed based on a communication method which varies according to a moving speed of the mobile terminal.
26. The mobile terminal for use in the communication system defined in claim 25, the mobile terminal comprising:
a transmitter-receiver for communicating with the stationary terminal;
a speed sensor for detecting the moving speed of the mobile terminal; and
a controller for determining the communication method according to the detected moving speed and for controlling the transmitter-receiver based on the determined communication method.
27. The stationary terminal for use in the communication system defined in claim 25, the stationary terminal comprising:
transmitter-receiver means for performing communication with the mobile terminal;
means for detecting the moving speed of the mobile terminal; and
means for determining the communication method according to the detected moving speed and for controlling the transmitter-receiver means based on the determined communication method.