Patent ID: 9194336
Filing Date: 2015-11-24
Classification: F02M

Abstract:
1. A carburetor and starting device, comprising an intake passage, a metering chamber, a manually operated primary pump for suctioning and pumping fuel, the primary pump being arranged on a fuel introduction path in communication on an introduction side with the metering chamber; and a fixed-quantity fuel chamber for temporarily storing fuel that has been drawn from the metering chamber and delivered from the primary pump; wherein the starting device feeds a fixed quantity of starting fuel from the fixed-quantity fuel chamber to an the intake passage during engine start-up; wherein at least a part of an internal wall of the fixed-quantity fuel chamber undergoes elastic displacement, allowing the internal capacity of the fixed-quantity fuel chamber to expand and contract within a predetermined range; the fixed-quantity fuel chamber is connected to a fuel delivery path that communicates with the intake passage, the fuel delivery path having a manually operated open/close valve provided partway there along and biased to a closed position; the open/close valve of the fuel delivery path is manually opened in a state in which, due to the primary pump being operated, the fixed-quantity fuel chamber is filled with a predetermined quantity of starting fuel while the internal capacity of the fixed-quantity fuel chamber is enlarged, whereby the fixed-quantity fuel chamber contracts due to an elastic contraction force and discharges a given quantity of starting fuel to the intake passage via the fuel delivery path, wherein the fixed-quantity fuel chamber is equipped with a locking means for locking the internal wall that has undergone displacement to an extent at which the internal capacity has expanded to a predetermined level, the internal wall being locked at the associated position, and for automatically stopping operation of the interior wall in the direction of contraction; wherein, in association with the open/close valve being opened, a state of locking applied by the locking means is canceled, the fixed-quantity fuel chamber is caused to contract, and the starting fuel is discharged, wherein the at least a part of the internal wall of the fixed-quantity fuel chamber that undergoes elastic displacement is a diaphragm, wherein the locking means includes a stopper operably couplable to the open/close valve on a first end and a guide rod coupled on a first end to the diaphragm and engageable on a second end with the stopper to lock the diaphragm that has undergone displacement to an extent at which the internal capacity of the fixed-quantity fuel chamber has expanded to a predetermined level, the diaphragm being locked at the associated position and prevented from moving in the direction of contraction.