Claims
- 1. A screw machine comprising a rotor housing having a pair of parallel, overlapping bores; a conjugate pair of intermeshing rotors located in said bores, each of said rotors having helical lobes and intervening flutes; said rotors having contact bands whereat torque is transmitted from one rotor to another rotor; characterized by a wear resistant coating disposed on the contact bands of said rotors.
- 2. The screw machine of claim 1 wherein the contact bands on said rotors are located away from the respective pitch circles of said rotors.
- 3. The screw machine of claim 1 wherein said wear resistant coating comprises a diamond-like-carbon coating made up of a series of alternating hard and lubricious layers.
- 4. The screw machine of claim 3 wherein the contact bands on said rotors are located away from the respective pitch circles of said rotors.
REFERENCE TO RELATED APPLICATION
[0001] This application is a division of U.S. patent application Ser. No. 09/607,764, filed Jun. 30, 2000, for Screw Machine.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60166041 |
Nov 1999 |
US |
Divisions (1)
|
Number |
Date |
Country |
Parent |
09607764 |
Jun 2000 |
US |
Child |
10307802 |
Dec 2002 |
US |