US 11,713,738 B2
Fuel feed unit and two-stroke engine having a fuel feed unit
Michael Grether, Waiblingen (DE); Johannes Alber, Stuttgart (DE); Michael Raffenberg, Fellbach (DE); and Hannes Frank, Ludwigsburg (DE)
Assigned to Andreas Stihl AG & Co. KG, Waiblingen (DE)
Filed by Andreas Stihl AG & Co. KG, Waiblingen (DE)
Filed on Jul. 15, 2022, as Appl. No. 17/866,374.
Claims priority of application No. 21185729 (EP), filed on Jul. 15, 2021.
Prior Publication US 2023/0013645 A1, Jan. 19, 2023
Int. Cl. F02B 25/14 (2006.01); F02M 35/10 (2006.01); F02B 25/22 (2006.01); F02M 35/108 (2006.01)
CPC F02M 35/1019 (2013.01) [F02B 25/22 (2013.01); F02M 35/108 (2013.01); F02B 2710/034 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A fuel feed unit for feeding fuel to a two-stroke engine, the fuel feed unit comprising:
a base body having an intake channel section formed therein;
at least one fuel opening which opens into said intake channel section;
a throttle flap configured to control a free flow cross section of said intake channel section;
said throttle flap being mounted pivotably about a pivot axis;
a partition wall section extending in said intake channel section at least upstream of said throttle flap;
said partition wall section dividing said intake channel section into a mixture channel into which said fuel opening is configured to feed fuel and an air channel;
said partition wall section having a recess;
said throttle flap having an end position in which said throttle flap at least partially lies in said recess;
said partition wall section having, upstream of said recess, a continuous mixture channel surface which faces said mixture channel and which has lateral sections adjacent to said intake channel wall and a middle section running between said lateral sections;
said lateral sections having, upstream of the throttle flap, a separation edge for the flow in said mixture channel and, in the end position of said throttle flap, a side of said throttle flap, which faces the mixture channel, defining a reference plane which divides the fuel feed unit into a first region, in which said throttle flap is arranged, and a second region; and,
said lateral sections extending, at least directly upstream of said recess, into said second region of the fuel feed unit.