Preloaded compliant linkage for fuel injection pump rack

Details Preloaded compliant linkage for fuel injection pump rack Preloaded compliant linkage for fuel injection pump rack

1987-10-16

1989-07-25

Miller, Carl Stuart

Internal-combustion engines

Engine speed regulator

Having condition responsive means with engine being part of...

123364, 123357, F02M 3900

Patent

active

048503215

ABSTRACT:
In a fuel injection system having a stepper motor (40) positioning the pump rack (32) in the fuel injection pump (18) to control the end of injection, a preloaded, compliant linkage (52,54,56) is interposed between the stepper motor output pinion gear (48) and the pump rack (32) to prevent a phase shift between the actual and the desired stepper motor position. The preload of the linkage (52,54,56) is set at greater than the normal operating load and less than the stepper motor output. The linkage includes a rack member (52) that is urged by a spring-loaded mechanism (76) against the output pinion (48) of the stepper motor (40) to maintain tooth engagement, and a clevis member (56) that is pivoted to allow the rack member to move away from the pinion in the event of a pump rack load of extremely high (tooth-damaging) magnitude. A closed throttle position is assured by a spring (99) urging the single-acting linkage against a stop (98).

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