US 4,057,044 AGranted

Hydraulic aneroid control and fluid flow restricting device for use therewith

AssigneeDeere & Company

InventorSteven Anthony Reich

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Abstract

Disclosed herein is a hydraulic aneroid control consisting of a housing containing a hydraulic piston and a flow control mechanism. The housing attaches to the governor housing so that the piston can move the fuel control shaft which engages the aneroid. When the engine is started, engine oil pressure acts on the piston to engage the aneroid. When the engine is not running, spring force moves the piston and fuel control shaft to the disengage position. The flow control mechanism restricts oil flow into the cylinder thus slowing the piston movement and increasing the time to engagement so that even though engine oil comes up to pressure almost immediately upon cranking of the engine, aneroid engagement is delayed until after the engine starts. The flow control mechanism also includes a check valve to bypass the flow restriction when the engine is shut down so that the aneroid is disengaged quickly and the engine has a fast re-start capability. In the preferred embodiment of the invention the flow restriction takes the form of a bore with a wire loosely positioned therein, the bore and wire forming a capillary.

Claims7

Dependent claims

In a fuel injection pump assembly for use with a turbocharged internal combustion engine, the injection pump assembly including a governor controlled fuel control rack, an aneroid adapted to be connected to and responsive to pressure within the intake manifold of the engine with which it will be used to limit movement of the fuel control rack in a direction to increase fuel delivery during periods of low intake manifold pressure, the aneroid having a control member shiftable between rack engaged and disengaged positions, means resiliently urging the shiftable control member to the rack disengaged position, and hydraulic cylinder and piston means adapted to be connected to and responsive to fluid pressure from the oil pump of the engine with which it will be used to move the shiftable control member to the rack engaged position, the improvement comprising:

the piston of the hydraulic cylinder and piston means having a predetermined amount of travel prior to contacting and moving the shiftable member, and the hydraulic cylinder and piston means includes a flow restricting means limiting the flow of fluid thereto whereby, when in use with an engine the aneroid will be unable to limit fuel control rack movement until a period of time after the oil pump of the engine has operated at pressure.

Dependencies are inferred from the claim text.