Title: Drive engine for motor car accessory units

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Claims: I claim:

1. An auxiliary driving device for driving units auxiliary to an internal combustion engine having an induction duct, comprising an expansion engine located in the induction duct of said internal combustion engine and driven by air passing through said induction duct whereby said expansion engine acts as a throttling device in said induction duct, and at least one bypass duct having a throttling device therein which duct bypasses said expansion engine whereby air may enter into the internal combustion engine when said expansion engine is not operating.

2. An auxiliary driving device according to claim 1 wherein said expansion engine comprises an air turbine.

3. An auxiliary driving device according to claim 1 wherein said expansion engine comprises a sliding vane-type displacement engine having a casing and a rotor eccentrically mounted in said casing and carrying said vanes.

4. An auxiliary driving device according to claim 3 wherein said expansion engine has a plurality of expansion stages of different expansion ratios and swept volumes each having a rotor therein and where said stages are adapted to be transversed by air passing through said duct, and said device has in addition control means for controlling flow of air to each said stage.

5. An auxiliary driving device according to claim 4 wherein said control means successively connects stages of diminishing expansion ratios with induction air in response to an accelerator pedal position.

6. An auxiliary driving device according to claim 4 wherein the rotors in the stages are all concentric with a common drive shaft.

7. An auxiliary driving device according to claim 6 having in addition an overrunning clutch associated with each rotor for selectively connecting a rotor to said common drive shaft whereby only the fastest rotating rotor will be drivingly connected to said shaft.

Other info:

Inventors: Laing, Nikolaus (7141 Aldingen near Stuttgart, DT)

Application Number: 419211
Filing Date: 1973-11-26
Publication_date: 1976-05-25
Assignee:
Primary Class(es): 60/397 60/425, 60/468, 60/483
Other Classes:
US Patent Ref:

900342	Oct, 1908	Ashley	60/425.
1244686	Oct, 1917	Bamford	60/397.
1349924	Aug, 1920	Swanson	60/483.
1834368	Dec, 1931	Arbuckle	60/397.
2163079	Jun, 1939	Benedek	60/425.
2374588	Apr, 1945	Doran	60/425.
3180079	Apr, 1965	Freeman	60/397.
3582245	Jun, 1971	Wallace	418/210.
3828555	Aug, 1974	Capdevielle	60/483.

Other Refs:
Primary Examiner: Geoghegan, Edgar W.
Assistant Examiner:
Attorney: Pennie & Edmonds