Abstract:
The invention relates to an assembly (30) for an electrically operated valve in the automotive field aimed to increase the injection pressure of a fuel within a combustion chamber, said assembly comprising both a coil unit (32) wherein a solenoid can control the movements of the electrically operated valve along a given axis (35) and an hydraulic unit (31) to provide fuel at the injection pressure, an elastic ring (34) being axially compressed between said coil unit (32) and said hydraulic unit (31). A part (36) of the coil unit (32) and a part (37) of the hydraulic unit (31) are locked under a mechanical pressure due to an elastic deformation of said coil unit part (36) and/or said hydraulic unit part (37) while the elastic ring (34) maintains an axial load keeping said coil unit part (36) and/or said hydraulic unit part (37) under tension.
Abstract:
A valve assembly for controlling the rate of flow of fluid between a valve inlet (18) and a valve outlet (22) comprises a valve housing (10), and a spool valve member (14) that is movable axially within a valve bore (12) provided in the valve housing (10) in an opening direction and a closing direction. The spool valve member (14) is provided with a blind bore (28), the open end of which communicates with the valve outlet, and at least one opening (32, 34; 40; 50, 52, 54, 56) into the blind bore, the at least one opening communicating, to a variable degree dependent on the axial position of the spool valve member (14) within the valve bore (12), with the valve inlet (18). The valve inlet (18) comprises a first boundary (24) and a second boundary (26), wherein the first boundary (24) acts as a control edge so that for axial positions of the spool valve member (14) in which the opening (30, 32; 40; 50, 52, 54, 56) does not overlap the control edge there is no flow into the outlet (22). A blind end (30) of the blind bore (28) is positioned, for all positions of the spool valve member (14) within the valve bore (12), beyond the second boundary (26) in the opening direction of the spool valve member (14).
Abstract:
An inlet valve assembly (14) for a high-pressure fuel pump is disclosed. The inlet valve assembly comprises an inlet valve member (28) moveable between open and closed positions to control the fuel flow from a source (24) of low-pressure fuel to a pumping chamber (16) of the fuel pump, a first biasing spring (70) arranged to apply a first force to the valve member (28) in an opening direction, a second biasing spring (74) arranged to apply a second force to the valve member (28) in a closing direction, and an actuator arrangement (50) operable to remove the first force from the valve member (28), thereby to allow the valve member (28) to move into its closed position.
Abstract:
An inlet valve assembly (14) for a high-pressure fuel pump is disclosed. The inlet valve assembly comprises an inlet valve member (28) moveable between open and closed positions to control the fuel flow from a source (24) of low-pressure fuel to a pumping chamber (16) of the fuel pump, and an electromagnetic actuator (50) comprising a core member (52), a solenoid coil (54), and an armature (58) moveable towards the core member (52) in response to energisation of the coil (54). In a first phase of operation, the armature (58) is decoupled from the valve member (28) to allow movement of the armature (58) towards the core member (52) without movement of the valve member (28) and, in a second phase of operation, the armature (58) is coupled to the valve member (28) to carry the valve member (28) towards its closed position. Because the armature (58) is initially decoupled from the valve member (28), variations in concentricity and part dimensions due to manufacturing tolerances can be accommodated without affecting operation of the valve assembly.
Abstract:
The invention relates to an assembly (30) for an electrically operated valve (34) in the automotive field aimed to increase the injection pressure of fuel distributed to combustion chambers, said assembly (30) comprising both a coil unit (32), wherein a solenoid (33) can control the movements of the electrically operated valve (34) in a housing along a given axis (36), and an hydraulic unit (35) to provide fuel at the injection pressure, a clip ring (38) being located into a cavity of the coil unit (32) and a cavity of the hydraulic unit (35) to maintain the coil unit (32) and the hydraulic unit (35) associated. The invention is characterized in that the coil unit (32) presents a plurality of slots (46) providing access to the clip ring (38), across the coil unit, from the exterior of the assembly.
Abstract:
An electro-valve for discharging a common rail while maintaining a minimum pressure, comprising an electro-magnetic coil inside which is arranged a movable plunger, controlling the displacements of a movable axis engaging a ball valve, said movable plunger being urged in the closing position of the ball valve by a spring housed inside a bearing cap, wherein a bottom wall of the bearing cap surrounds an external surface of the movable plunger, wherein a clearance between the external surface of the plunger and an internal wall of the bearing cap is filled with a film of fuel, the opening movement of the plunger causing the fuel to flow from a room situated on top of the plunger to a bore in which the axis is arranged, wherein a sleeve of a controlled thickness is arranged around the plunger within the clearance to set the thickness of said film of fuel.