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US 7,243,621 B2Granted
Two-stroke engine
AssigneeAndreas Stihl AG & Co. KG
InventorWerner Geyer
Life of this patent
Estimating the term…
Abstract
A two-stroke engine (1, 31, 41, 51) includes a cylinder (2) having a combustion chamber (5). The combustion chamber (5) is delimited by a piston (7) which drives a crankshaft (25) rotatably journalled in a crankcase (3). The two-stroke engine (1, 31, 41, 51) includes a fuel line (14) wherein an electromagnetic valve (18) is mounted. The valve (18) is controlled by a control unit. An air channel (27) is provided for supplying combustion air. The two-stroke engine (1, 31, 41, 51) has at least one transfer channel (12) which connects the combustion chamber (5) to the crankcase (3) at pregiven piston positions. An ignition module (20, 30) is provided which triggers the ignition of a spark plug (8) projecting into the combustion chamber (5). The valve (18) and the control of the valve (18) are integrated into the ignition module (20, 30).
Claims20
A two-stroke engine comprising:
- a cylinder;
- a piston mounted in said cylinder to undergo a reciprocating movement along a stroke path between top dead center and bottom dead center during the operation of said engine;
- said cylinder and said piston conjointly delimiting a combustion chamber;
- a crankcase connected to said cylinder;
- a crankshaft rotatably mounted in said crankcase;
- said piston being connected to said crankshaft for imparting rotational movement to said crankshaft;
- a fuel tank;
- a fuel line for conducting fuel from said fuel tank;
- an electromagnetic valve mounted in said fuel line;
- an air channel for supplying combustion air to said engine;
- a transfer channel for connecting said combustion chamber to said crankcase at pregiven positions of said piston;
- a spark plug projecting into said combustion chamber;
- a control unit for controlling said electromagnetic valve;
- an ignition module for triggering the ignition of said spark plug;
- and,
- said control unit and said electromagnetic valve being integrated into said ignition module.
13 more elements
A two-stroke engine comprising:
- a cylinder;
- a piston mounted in said cylinder to undergo a reciprocating movement along a stroke path between top dead center and bottom dead center during the operation of said engine;
- said cylinder and said piston conjointly delimiting a combustion chamber;
- a crankcase connected to said cylinder;
- a crankshaft rotatably mounted in said crankcase;
- said piston being connected to said crankshaft for imparting rotational movement to said crankshaft;
- a fuel tank;
- a fuel line for conducting fuel from said fuel tank;
- an electromagnetic valve mounted in said fuel line;
- an air channel for supplying combustion air to said engine;
- a transfer channel for connecting said combustion chamber to said crankcase at pregiven positions of said piston;
- a spark plug projecting into said combustion chamber;
- a control unit for controlling said electromagnetic valve;
- an ignition module for triggering the ignition of said spark plug;
- said control unit and said electromagnetic valve being integrated into said ignition module;
- and,
- said electromagnetic valve being mounted with the ignition module in a common housing.
14 more elements
A two-stroke engine comprising:
- a cylinder;
- a piston mounted in said cylinder to undergo a reciprocating movement along a stroke path between top dead center and bottom dead center during the operation of said engine;
- said cylinder and said piston conjointly delimiting a combustion chamber;
- a crankcase connected to said cylinder;
- a crankshaft rotatably mounted in said crankcase;
- said piston being connected to said crankshaft for imparting rotational movement to said crankshaft;
- a fuel tank;
- a fuel line for conducting fuel from said fuel tank;
- an electromagnetic valve mounted in said fuel line;
- an air channel for supplying combustion air to said engine;
- a transfer channel for connecting said combustion chamber to said crankcase at pregiven positions of said piston;
- a spark plug projecting into said combustion chamber;
- a control unit for controlling said electromagnetic valve;
- an ignition module for triggering the ignition of said spark plug;
- said control unit and said electromagnetic valve being integrated into said ignition module;
- and,
- said ignition module and said electromagnetic valve being cast with each other.
14 more elements
A two-stroke engine comprising:
- a cylinder;
- a piston mounted in said cylinder to undergo a reciprocating movement along a stroke path between top dead center and bottom dead center during the operation of said engine;
- said cylinder and said piston conjointly delimiting a combustion chamber;
- a crankcase connected to said cylinder;
- a crankshaft rotatably mounted in said crankcase;
- said piston being connected to said crankshaft for imparting rotational movement to said crankshaft;
- a fuel tank;
- a fuel line for conducting fuel from said fuel tank;
- an electromagnetic valve mounted in said fuel line;
- an air channel for supplying combustion air to said engine;
- a transfer channel for connecting said combustion chamber to said crankcase at pregiven positions of said piston;
- a spark plug projecting into said combustion chamber;
- a control unit for controlling said electromagnetic valve;
- an ignition module for triggering the ignition of said spark plug;
- said control unit and said electromagnetic valve being integrated into said ignition module;
- a fuel pump mounted upstream of said electromagnetic valve;
- a pressure controller:
- and,
- said electromagnetic valve being connected to said fuel pump via said pressure controller.
16 more elements
A two-stroke engine comprising:
- a cylinder;
- a piston mounted in said cylinder to undergo a reciprocating movement along a stroke path between top dead center and bottom dead center during the operation of said engine;
- said cylinder and said piston conjointly delimiting a combustion chamber;
- a crankcase connected to said cylinder;
- a crankshaft rotatably mounted in said crankcase;
- said piston being connected to said crankshaft for imparting rotational movement to said crankshaft;
- a fuel tank;
- a fuel line for conducting fuel from said fuel tank;
- an electromagnetic valve mounted in said fuel line;
- an air channel for supplying combustion air to said engine;
- a transfer channel for connecting said combustion chamber to said crankcase at pregiven positions of said piston;
- a spark plug projecting into said combustion chamber;
- a control unit for controlling said electromagnetic valve;
- an ignition module for triggering the ignition of said spark plug;
- said control unit and said electromagnetic valve being integrated into said ignition module;
- a fuel pump mounted upstream of said electromagnetic valve;
- and,
- said fuel pump being integrated into said ignition module.
15 more elements
A two-stroke engine comprising:
- a cylinder;
- a piston mounted in said cylinder to undergo a reciprocating movement along a stroke path between top dead center and bottom dead center during the operation of said engine;
- said cylinder and said piston conjointly delimiting a combustion chamber;
- a crankcase connected to said cylinder;
- a crankshaft rotatably mounted in said crankcase;
- said piston being connected to said crankshaft for imparting rotational movement to said crankshaft;
- a fuel tank;
- a fuel line for conducting fuel from said fuel tank;
- an electromagnetic valve mounted in said fuel line;
- an air channel for supplying combustion air to said engine;
- a transfer channel for connecting said combustion chamber to said crankcase at pregiven positions of said piston;
- a spark plug projecting into said combustion chamber;
- a control unit for controlling said electromagnetic valve;
- an ignition module for triggering the ignition of said spark plug;
- said control unit and said electromagnetic valve being integrated into said ignition module;
- a fuel pump mounted upstream of said electromagnetic valve;
- and,
- said fuel pump being mounted in said fuel tank.
15 more elements
A two-stroke engine comprising:
- a cylinder;
- a piston mounted in said cylinder to undergo a reciprocating movement along a stroke path between top dead center and bottom dead center during the operation of said engine;
- said cylinder and said piston conjointly delimiting a combustion chamber;
- a crankcase connected to said cylinder;
- a crankshaft rotatably mounted in said crankcase;
- said piston being connected to said crankshaft for imparting rotational movement to said crankshaft;
- a fuel tank;
- a fuel line for conducting fuel from said fuel tank;
- an electromagnetic valve mounted in said fuel line;
- an air channel for supplying combustion air to said engine;
- a transfer channel for connecting said combustion chamber to said crankcase at pregiven positions of said piston;
- a spark plug projecting into said combustion chamber;
- a control unit for controlling said electromagnetic valve;
- an ignition module for triggering the ignition of said spark plug;
- said control unit and said electromagnetic valve being integrated into said ignition module;
- a fuel pump mounted upstream of said electromagnetic valve;
- and,
- said fuel pump being mounted in said crankcase.
15 more elements
A two-stroke engine comprising:
- a cylinder;
- a piston mounted in said cylinder to undergo a reciprocating movement along a stroke path between top dead center and bottom dead center during the operation of said engine;
- said cylinger and said piston conjointly delimiting a combustion chamber;
- a crankcase connected to said cylinder;
- a crankshaft rotatably mounted in said crankcase;
- said piston being connected to said crankshaft for imparting rotational movement to said crankshaft;
- a fuel tank;
- a fuel line for conducting fuel from said fuel tank;
- an electromagnetic valve mounted in said fuel line;
- an air channel for supplying combustion air to said engine;
- a transfer channel for connecting said combustion chamber to said crankcase at pregiven positions of said piston;
- a spark plug projecting into said combustion chamber;
- a control unit for controlling said electromagnetic valve;
- an ignition module for triggering the ignition of said spark plug;
- said control unit and said electromagnetic valve being integrated into said ignition module;
- a fuel pump mounted upstream of said electromagnetic valve;
- a throttle flap housing;
- a throttle flap pivotally mounted in said air channel within said housing;
- and,
- said fuel pump being mounted in said throttle flap housing.
17 more elements
Dependencies are inferred from the claim text.