Onan Corporation

John C Fanner

Nick V Halstead

Steven M Swanson

An apparatus for assisting a primary governor device (20) on an engine at certain load conditions or during transient loading is disclosed. The primary governor device has a control arm (12) which is moved by a primary governor spring (15) via a primary governor arm (14). The control arm (12) governs opening and closing of the throttle plate (10) on the carburetor (11). Four embodiments (47, 54, 30 and 78) of the governor assist mechanism are disclosed. The governor assist apparatus has an assist spring (48, 55, 32, 76) operatively connected to the control arm (12). A vacuum capsule (41) actuates the assist spring (48, 55, 32, 76) from the primary governor device (20) according to the vacuum in the intake manifold and load on the engine. The first embodiment or linear mechanism (47) has an assist spring (48), an intermediate link (49), and the diaphragm plunger (40) in linear alignment. The second embodiment or rocker mechanisn (54) interconnects the assist spring (55) and the diaphragm plunger (40) by means of a pivotal arrangement or bell crank (58). The third embodiment or hinge mechanism (30) has an intermediate link (36) which abuts against a clip (49) on the control arm (12). The fourth embodiment or governor retarding mechanism (78) has the assist spring (76) positioned directly between the primary governor arm (14) and vacuum capsule (41).

Governor assist mechanism

An apparatus for assisting a primary governor device (20) on an engine at certain load conditions or during transient loading is disclosed. The primary governor device has a control arm (12) which is moved by a primary governor spring (15) via a primary governor arm (14). The control arm (12) governs opening and closing of the throttle plate (10) on the carburetor (11). Four embodiments (47, 54, 30 and 78) of the governor assist mechanism are disclosed. The governor assist apparatus has an assist spring (48, 55, 32, 76) operatively connected to the control arm (12). A vacuum capsule (41) actuates the assist spring (48, 55, 32, 76) from the primary governor device (20) according to the vacuum in the intake manifold and load on the engine. The first embodiment or linear mechanism (47) has an assist spring (48), an intermediate link (49), and the diaphragm plunger (40) in linear alignment. The second embodiment or rocker mechanism (54) interconnects the assist spring (55) and the diaphragm plunger (40) by means of a pivotal arrangement or bell crank (58). The third embodiment or hinge mechanism (30) has an intermediate link (36) which abuts against a clip (49) on the control arm (12). The fourth embodiment or governor retarding mechanism (78) has the assist spring (76) positioned directly between the primary governor arm (14) and vacuum capsule (41).

Carburetor altitude compensator apparatus (20) includes fingertip adjustable fuel to air mixture adjustment screw (22). The adjustment screw (22) includes a tracking member (30) rotatable therewith and cooperating with a graduated scale (42) to indicate the altitude at which optimum fuel/air mixture is derived for any given setting of the adjustment screw (22). An indentation (34) cooperates with the tracking member (30) to limit the range of possible adjustment of the adjustment screw (22) so as to avoid engine damage regardless of what adjustment the adjustment screw (22) is set at.

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Coon Rapids, MN, United States of America

John C Fanner