EGR system and improved actuator therefor

Details EGR system and improved actuator therefor EGR system and improved actuator therefor

1997-06-24

1999-08-17

Dollnar, Andrew M.

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

25412913, F02M 2504

Patent

active

059378352

ABSTRACT:
An exhaust gas recirculation (EGR) system (11), especially for a diesel engine, having a valve (25), including a valve stem (29,31) and an actuator operable to move the valve (25) between the open (FIG. 1) and closed positions. The actuator includes an electric motor (47) which provides a low torque, high speed rotary output (51) to an input gear (53) of a reduction gear train (55). The output of the gear train is a relatively high torque, low speed rotation of an output gear (79), which is connected by a linkage (83,85) to the input stem (31) of the valve. The gear train (55) includes a torque limiting clutch (67,69) to protect the teeth of the gears, and a coupling arrangement (91) joins the valve stems (29,31) to permit mis-alignment therebetween.

REFERENCES:
patent: 4473056 (1984-09-01), Ishida et al.
patent: 4690119 (1987-09-01), Makino et al.
patent: 5035228 (1991-07-01), Bender
patent: 5094218 (1992-03-01), Everingham et al.
patent: 5606957 (1997-03-01), Feucht
patent: 5727653 (1998-03-01), Grossenbacher et al.

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