Claims
- 1. A piston (1) for a compressor, in particular a coolant compressor of an air-conditioning system, comprising:
a piston head (2) by means of which a medium can be compressed, a piston stem section (3) extending from the piston and guiding the piston in an axially displaceable fashion in a cylinder housing, and a force application section (4) for the application of a drive force to the piston head (2), said piston head (2), said piston stem (3) and said force application section (4) being arranged one after the other in the direction of the piston axis, said piston stem (3) having a solid strut structure (5a, 5b) oriented in the direction of the piston axis and having a cross-sectional area smaller than the area of the piston head (2), and said piston stem (3), said force application section (4) and said piston head (2) being formed integrally from a nonorganic and nonmetalic material having an average thermal expansion of less than 7*10−6/° C. in the temperature range between 0° C. and 200° C.
- 2. The piston as claimed in claim 1, wherein the strut structure (5e) has a cross section which is one of V-shaped, U-shaped, M-shaped, W-shaped and wave-shaped in a cross-section transversely with respect to the piston axis.
- 3. The piston as claimed in claim 1, wherein the piston stem (3) has at least on plate-shaped guide structure (6) which is spaced from the piston head (2) and whose cross-sectional area corresponds in shape and size at least approximately to the area of the piston head (2).
- 4. The piston as claimed claim 1, wherein the piston stem (3) comprises a plurality of rib-shaped, radially extending struts (5b, 5c).
- 5. The piston as claimed in claim 4, wherein the rib-shaped radially extending struts (5b, 5c) are arranged in a star shape about a core strut (5a).
- 6. The piston as claimed in claim 1, wherein at least one strut (5b, 5b′) has a radially externally located sliding surface (5d) for guiding the cylinder (1, 1′) in the cylinder housing.
- 7. The piston as claimed in claim 1, wherein the piston stem (3) comprises a plurality of struts (5b, 5b′, 5c) which are arranged distributed asymmetrically and non-uniformly in accordance with an application of force effective outside the piston axis.
- 8. The piston as claimed in claim 2, wherein the piston stem (3″) has a tubular guide section (6″) which has an at least partially cylindrical outer surface and which at least partially encloses the strut (5″).
- 9. The piston as claimed in claim 8, wherein a pocket, which is open at the end of the guide section remote from the piston head (2) and has an approximately sickle-shaped cross-sectional area which is oriented transversely with respect to the piston axis, is formed between the tubular guide section (6″) and the strut (5″).
- 10. The piston as claimed in claim 8, wherein a recess is formed by said strut 5″ which extends along the piston axis and has an approximately constant cross-section with an angle of aperture of 20° to 120°, in particular approximately 45° C.
- 11. The piston as claimed in claim 1, wherein the piston stem (3), the force application section (4) and the piston head (2) are embodied monolithically without structural cavities from a fine-grain graphite.
- 12. The piston as claimed in claim 11, wherein the slide surface of the guide section (6) and of the slide surface of the piston has openings whose spatial extent is between 0.1 μm and 1 mm, the graphite of which the piston consists preferably having a pore component of 16 to 50 vol. %.
- 13. The piston as claimed in claim 12, wherein the external guide faces of the piston are provided with one of an organic, inorganic and metallic coating providing for the geometric surface structure with said openings.
- 14. The piston as claimed in claim 1, wherein the force application section (4) has a shoulder for engaging a force application means.
- 15. The piston as claimed in 1, wherein a reinforcement element is incorporated in the force application section (4)
- 16. The piston as claimed in claim 15, wherein said reinforcement element is an inlay in the force application section (4) and is constructed from a material other than said piston.
- 17. The piston as claimed in claim 16, wherein said reinforcement element consists of a metallic material.
- 18. The piston as claimed in claim 15, wherein said reinforcement element is in the form of one of a U-shaped, L-shaped and hook-shaped inlay.
Priority Claims (2)
Number |
Date |
Country |
Kind |
101 07 424.7 |
Feb 2001 |
DE |
|
101 45 305.1 |
Sep 2001 |
DE |
|
Parent Case Info
[0001] This is a continuation-in-part application of international application PCT/EP02/01522 filed Feb. 14, 2002 and claiming the priority of German applications 101 07 424.7 filed Feb. 14, 2001 and 101 45 305.1 filed Sep. 14, 2001
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
PCT/EP02/01522 |
Feb 2002 |
US |
Child |
10834898 |
Aug 2003 |
US |