摘要:
A high-pressure pump includes a plunger capable of reciprocating, and a housing having a pressurizing chamber in which fuel is pressurized by the plunger, and a fuel chamber through which the fuel flows toward and from the pressurizing chamber. The pump includes a spring that biases the plunger so as to increase the volume of the r pressurizing chamber, and a spring seat that is fixed to the housing and is in contact with one end of the spring. A first space that communicates with the fuel chamber via a fuel passage is provided between the bottom of the spring seat and the housing, and a top face of the bottom exposed to the first space is covered with a heat insulating member.
摘要:
A multi-cylinder engine comprising a cylinder head (1) which has on one side an intake-air distributing passage wall (2) and on another side an exhaust-gas converging passage wall (3), a common rail (10) being arranged around the cylinder head (1). In this multi-cylinder engine, the common rail (10) is arranged immediately laterally of the intake-air distributing passage wall (2), thereby positioning the intake-air distributing passage wall (2) between the cylinder head (1) and the common rail (10). Preferably., an intake-air inlet pipe (11) stand ups at an upper portion of the intake-air distributing passage wall (2) and is provided with an intake-air flange portion (12), which is positioned just above the common rail (10).
摘要:
Described herein is a pump (7) for supplying a pressurized fuel to an internal-combustion engine, provided with: a body (16); a compartment (17) made within the body (16); at least one pumping element (13) housed in a mobile way in the compartment (17) for raising the pressure of the fuel; fluid-supply means (21) for delivering the fuel to the pumping element (13); and an inlet mouth (20) made in the body (16), supplied with the fuel coming directly from an external source (2) and fluidically connected to the compartment (17) for supplying it with the fuel for the purpose of lubricating and/or cooling the pump (7) itself; the fluid-supply means (21) comprise at least one further inlet mouth (21), which is made in the body (16) and is fluidically connected to the pumping element (13) for supplying it with the fuel received directly from the external source (2).
摘要:
The invention relates to a fuel injection system (1) for an internal combustion engine and to a method for controlling an injection system. According to said method, the fuel that is not required by a common-rail (14) is returned via a return line (24) to a fuel line area between a fuel filter (8) and a fuel tank (2). The fuel is heated as a result of being returned in this way, which prevents the filter (8) from becoming plugged below the cold filter plugging point.
摘要:
A fuel injector (10) is provided which has an injector body (11) with a metallic tip (12) having an outer surface. A non-metallic insulator (16), such as a ceramic, is attached to the tip (12) and covers a portion of the outer surface. Injector tip overheating can be a problem, especially during sustained two-cycle boosted engine compression release braking. In addition, injector tip overheating can be a problem when an engine is experiencing simultaneous engine compression release braking and exhaust braking.
摘要:
The invention relates to a stroke-controlled valve which is used as a fuel metering device of an injection system for internal combustion engines. Said valve has a valve needle (11) which can be actuated axially against the resistance of a spring (24), which is arranged in a graduated, coaxial recess (13) in a valve body (10) and which interacts with a valve seat (17) which is configured in the recess (13) of the valve body (10), hereby controlling the fuel injection process. The valve also comprises a high-pressure area (18) which is connected to an allocated injection nozzle and which is located in front of the valve seat (17), a low-pressure area (28) which is located behind the valve seat and which opens out into the fuel return passage (30); and a low-pressure compensating piston (22) which coaxially adjoins the valve (16, 17) and which is solidly connected to the valve needle. The invention is characterised in that a first control edge (39 or 42) is configured on the low-pressure compensating piston (22). Said control edge interacts with a second control edge (40 or 43) on the valve body recess (13) in the area of the fuel return passage (45, 30) or (48, 30) in such a way that a throttle cross-section (38, 38a or 46, 44a) that is dependent on the valve stroke (41) is formed between the two control edges (39, 40 or 42, 43).
摘要:
A distributor arrangement is disclosed which comprises a distributor member (18) rotatable within a bore formed in a sleeve (14), the sleeve (14) being provided with a supply port (22) through which fuel under high pressure can be supplied to the distributor member (18), in use, and a plurality of delivery ports (26), the distributor member (18) being provided with a delivery passage (32) registrable with the delivery ports (26), in turn, upon rotation of the distributor member (18) whereby fuel under pressure supplied through the supply port (22) flows to a selected one of the delivery ports (26), in use, the distributor arrangement further comprising a porting arrangement whereby, when the distributor member (18) occupies a position in which the delivery passage is not registered with any of the delivery ports (26), cooling fluid is able to flow through the delivery passage (32).
摘要:
Disclosed is a method for fuel injection in multicylinder engines, whereby a fuel prepressure is built up to feed the fuel to an inertia line by using the pressure impulse principle and by means of cutoff valves in the inertia line, wherein each injection nozzle assigned to a cutoff valve is fed by pressure impulse and the fuel not passing through the injection nozzle is fed back through the open cutoff valve via a return line upstream from the fuel pump (3).