US 7,097,165 B1Granted

Carburetor fuel adjustment and limiter assembly

AssigneeWalbro Engine Management, L.L.C.

InventorMatthew A. Braun

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Abstract

A carburetor fuel valve adjustment and limiter assembly for a combustion engine limits the maximum and minimum fuel amounts delivered through the valve of the carburetor. A needle valve of the adjustment and limiter assembly cooperates with a collar and pin generally located axially inward of an enlarged valve head. The collar of the limiter assembly is arranged telescopically with a valve shaft and yieldably biased to lock to the head when moved in an axially outward direction. When locked, and upon rotation of the valve, first and second stops carried by the collar are arranged to bear on a stationary pin carried by a carburetor body. During manufacture, the collar can be pushed axially inward against the bias of a spring to disengage the collar from the head to permit rotation of the needle valve while the collar remains stationary for unlimited adjustment of the needle valve.

Claims20

Dependent claims

A fuel adjustment and limiter assembly for a carburetor comprising:

a carburetor body;
a fuel passage in the body;
a bore in the body along a rotation axis and communicating with the fuel passage and opening to the exterior of the body;
a shaft disposed in the bore and threaded rotatably to the body along the rotation axis, and the shaft having a tip at one end disposed adjustably in the fuel passage;
an enlarged head generally concentric to and projecting axially outward from the other end of the shaft, the enlarged head having at least one feature carried by the head;
a collar carried by the shaft adjacent the head and generally axially movable relative to the head, a first stop carried by the collar, a second stop carried by the collar and circumferentially spaced from the first stop, at least one indicia carried by the collar and releasably engageable with the at least one feature for rotation of the collar with the shaft, the collar being axially movable relative to the head to a locked position wherein the at least one indicia engages the at least one feature for rotation of the collar with the shaft and axially movable to an unlocked position spaced from the locked position wherein the indicia and feature are disengaged so that the shaft can rotate relative to the collar;
and
a pin carried by the carburetor body, disposed between the first and second stops and engageable by the first and second stops at least when the collar is in the locked position to limit rotation of the shaft relative to the carburetor body.

5 more elements

A fuel adjustment and limiter assembly for limiting adjustment of fuel flow in a carburetor comprising:

a valve having a rotatable elongated shaft and a head sheltered laterally by the carburetor;
a first collar received over the shaft and movable to telescopically overlie the head, the first collar carrying a first stop and a second stop spaced circumferentially from the first stop;
an unlocked position of the first collar wherein the first collar is spaced axially inward from the head and disengaged from the head so that the head and shaft can be rotated relative to the carburetor;
a locked position of the first collar wherein the first collar is releasably mated to the head for rotation thereafter in limited rotational relationship to the carburetor;
a pin carried by the carburetor and disposed circumferentially between the first and second stops at least when the first collar is in the locked position;
and
the pin being engageable by the first stop when the first collar is in the locked position and the valve is rotated for minimal fuel flow, and the pin is engageable by the second stop when the first collar is in the locked position and the valve is rotated for maximum fuel flow.

4 more elements

Dependencies are inferred from the claim text.