1. A universal-joint shaft arrangement for prop shafts suitable for the transfer of torque having at least one spider, said shaft arrangement comprising:
at least one link yoke;
pins arranged around a center point and extending from a base body in pairs around a common axis, whereby the axes cross at the center point of the spider at a right angle;
each pin having a surface arranged concentrically around the respective pin axis and forming a contact surface or a surface for supporting rolling elements of a roller bearing;
a transition area between the surface forming a contact surface or supporting a contact surface and the base body;
a functional surface formed on sides of the base body facing the respective pin and attached to each pin for supporting at least one seal element by forming a sealing surface of a seal pairing;
the functional surface running perpendicular to a plane which is defined by the pin axis of the respective pin and the pin arranged next to it in the circumferential direction;
the functional surface extending from the transition area at least into an area in the radial direction around the pin axis having a radius which is at least 1.5 times the respective pin radius;
at least one centering surface arranged perpendicular to the respective functional surface for the immobilization of a seal holder carrying a sealing device and attached to each functional surface;
a bearing assembly of each pin comprising at least one radial bearing and one axial bearing mounted in the area of a respective pin root;
the bearing assembly sealed by means of the respective seal which is mounted in the seal holder;
the seal forming the seal pairing with the side of the base body associated with the respective pin;
the seal holder being attached to the spider.
2. The universal joint shaft in accordance with claim 1 wherein the functional surfaces on the spider are planar.
3. The universal joint shaft in accordance with claim 2 wherein the functional surface on the spider extends over the entire respective side formed by the base body.
4. The universal joint shaft in accordance with claim 2 wherein the functional surface on the spider is annular in the radial direction around the pin axis of the respective pin.
5. The universal joint shaft in accordance with claim 2 wherein the base body is shaped by a cube.
6. The universal joint shaft in accordance with claim 1 wherein the functional surfaces on the spider extend over the entire side formed by the base body.
7. The universal joint shaft in accordance with claim 6 wherein the functional surface on the spider is annular in the radial direction around the pin axis of the respective pin.
8. The universal joint shaft in accordance with claim 1 wherein the functional surfaces on the spider are annular in the radial direction around the pin axis of the respective pin.
9. The universal joint shaft in accordance with claim 1 wherein the base body is shaped like a cube.
10. The universal joint shaft in accordance with claim 9 wherein the centering surfaces attached to a functional surface are formed by the neighboring sides.
11. The universal joint shaft in accordance with claim 9 wherein the centering surfaces attached to a functional surface are arranged on the same side of the base body and the base body is provided with means for fastening the seal holder carrying the seal and which are at least partially arranged on the same side andor on the neighboring sides.
12. The universal joint shaft in accordance with claim 11 wherein the means are designed as threaded bore holes.
13. The universal joint shaft in accordance with claim 1 wherein the transition area is characterized by an increase in the diameter of the pin and a radius progression with a decreasing radius.
14. The universal joint shaft in accordance with claim 1 wherein the individual functional surface andor centering surface is ground.
15. The universal joint shaft in accordance with claim 1 characterized in that the individual functional surface andor centering surface is lathed.
16. The universal joint shaft in accordance with claim 1 wherein the surface forming a contact surface or indirectly supporting the contact surface is hardened.
17. The universal joint shaft in accordance with claim 16 wherein a hardness run-out extends into the transition area.
18. The universal joint shaft in accordance with claim 17 wherein the base body is shaped like a cube.
19. The universal joint shaft in accordance with claim 16 wherein carborizing hardening or inductive hardening are used as the hardening procedure.
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 electrostatically-doped carbon nanotube device, comprising:
a carbon nanotube disposed on a substrate such that at least a portion of the carbon nanotube is free-standing, wherein said carbon nanotube has a first end and a second end;
a first metal contact disposed directly adjacent to the first end of the carbon nanotube;
a second metal contact disposed directly adjacent to the second end of the carbon nanotube, wherein said carbon nanotube is electrically coupled to the first and second metal contacts;
a first metal electrode disposed in the substrate adjacent to and at a distance from the first end of the carbon nanotube, wherein the first metal electrode is capacitively coupled to the first end of the carbon nanotube and is operable for receiving a first bias to electrostatically dope the first end of the carbon nanotube; and
a second metal electrode disposed in the substrate adjacent to and at a distance from the second end of the carbon nanotube, wherein the second metal electrode is capacitively coupled to the second end of the carbon nanotube and is operable for receiving a second bias to electrostatically dope the second end of the carbon nanotube.
2. The electrostatically-doped carbon nanotube device of claim 1, wherein said substrate comprises a trench.
3. The electrostatically-doped carbon nanotube device of claim 1, wherein the first metal electrode and the second metal electrode each comprises a metal selected from the group consisting of Mo, Ti, Pt, and Au.
4. The electrostatically-doped carbon nanotube device of claim 1, wherein the first bias is operable for making the first end of the carbon nanotube either a p-type semiconductor (hole majority carrier) or an n-type semiconductor (electron majority carrier).
5. The electrostatically-doped carbon nanotube device of claim 1, wherein the second bias is operable for making the second end of the carbon nanotube one of a p-type semiconductor (hole majority carrier) and an n-type semiconductor (electron majority carrier).
6. The electrostatically-doped carbon nanotube device of claim 1, wherein the carbon nanotube comprises a carbon nanotube selected from the group consisting of a single-walled carbon nanotube and a multi-walled carbon nanotube.
7. The electrostatically-doped carbon nanotube device of claim 1, wherein said substrate comprises a dielectric material.
8. The electrostatically-doped carbon nanotube device of claim 7, wherein the dielectric material comprises a dielectric material selected from the group consisting of SiO2, Si3N4, Al2O3, and ZrO2.
9. The electrostatically-doped carbon nanotube device of claim 1, further comprising a base material, said substrate being disposed on said base material.
10. The electrostatically-doped carbon nanotube device of claim 9, wherein said base material comprises a semiconductor material.
11. The electrostatically-doped carbon nanotube device of claim 9, wherein said base material comprises a metal material.
12. A photovoltaic device comprising the electrostatically-doped carbon nanotube device of claim 1.
13. A power device comprising the electrostatically-doped carbon nanotube device of claim 1.
14. A sensor comprising the electrostatically-doped carbon nanotube device of claim 1.