Abstract: A structural unit for a drum brake comprises at least one brake shoe (12) and an adjusting device (32) which comprises an adjusting strut (34), a ratchet-detent wheel mechanism and an adjusting lever (40) which comprises the ratchet (52). The brake shoe (12) has a web (22) against which the adjusting strut (34) rests and on which the adjusting lever (40) is pivotably mounted by means of a bearing pin (56). In order to enable the structural unit with the adjusting device (32) to be easily retrofitted also in the case of older drum brakes the bearing pin (56) is attached to a separate carrier member (66) which can be slid onto the web (22) of the brake shoe (12) in a clamping manner and which comprises at least one first offset (84) which positively engages a recess (86) provided in the web (22). In this manner, the bearing pin (56) is reliably and true-to-position secured at the brake shoe web (22).

Abstract: A fuel injector includes a tip member having a further member establishing an interference fit about an outer surface thereof at an injection end to minimize the possibility of fracture or other failure.

Abstract: An injector is disclosed which comprises a valve needle engageable with a seating. A spring urges the needle towards its seating, the spring engaging a spring abutment. A pressure backing member positioned within the injector is slidable relative to the spring abutment under the action of the pressure of fuel applied thereto. The pressure backing member is engageable with a surface associate with the needle to urge the needle towards its seating. The slidable pressure backing member reduces the pressure in the pumping chamber both prior to and after termination of the injection process. Also, the backing member maintains the pressure in a fuel supply passage of a low level to enhance the efficiency of the injector.

Abstract: A measuring apparatus comprises a sensor having a vibrating beam whose resonant frequency represents a parameter, such as pressure, to be measured. A light guide supplies light from a source to the beam and returns light reflected from the beam and from the end of the guide to an interferometer. The difference in light paths is greater than the coherent length of the light. The interferometer has first and second paths which differ in length by the difference in the light paths plus an odd number of quarter wavelengths of the light.

Abstract: A fuel system is described which comprises a high pressure fuel pump arranged to supply fuel under pressure to a plurality of injectors. A backleak connection line is arranged to return fuel from the injectors to a fuel reservoir. A venturi pump is connected to the backleak connection line and is arranged to draw fuel from the line to reduce the fuel pressure therein.

Abstract: A fuel injector includes a solenoid having two armatures which are complementarily shaped to define a stepped armature gap.

Abstract: A contactor comprises first and second armatures which are urged towards contact-making positions by first and second windings, respectively. Each of the armatures displaces the other armature from its contact-making position when moving towards its own contact-making position. A controller actuates each of the windings before deactuating the other of the windings.

Abstract: A control valve of an engine fuel system includes a valve member which is coupled to an armature and is moved to engage a seating when a winding is energized. The current flow in the winding is first allowed to rise to a peak value to initiate movement of the armature and valve member at which time the winding is disconnected from the supply. The decay of current in the winding is controlled using two rates of current decay to ensure that the valve member moves into engagement with the seating with the minimum of bounce.

Abstract: A filter comprises a filter cartridge located within a housing. Fuel flows through a filter medium of the cartridge, in use, from an outer chamber to an inner chamber. From the inner chamber, the fuel flows over and around a sedimentation baffle located within a sedimentation chamber. Fuel exits the sedimentation chamber through an outlet passage, an air collection chamber being arranged to collect air from the flow of fuel. Air exits the air collection chamber via openings.

Abstract: A rotary pump such as a rotary fuel injection pump comprises a pump body; a rotor rotatably supported by the pump body and responsive to mechanical pulses to pump a fluid; and a stator ring (208) supported by the pump body and having a ring of projections (209) arranged to deliver mechanical pulses to the rotor when the rotor rotates relative to the stator ring. The stator ring (208) has a vibrational mode which is induced by delivering the mechanical pulses to the rotor. The pump body supports the stator ring across an interface which is a complete annulus or a partial annulus. In order to reduce the transmission of vibration from the stator ring to the pump body, the interface and/or stator ring incorporate cavities at the antinodes of the vibrational mode of the stator ring.

Abstract: A fuel injector includes a center tube, a first valve separate from the center tube and surrounding a first end of the center tube and a second valve also separate from the center tube and surrounding a second end thereof. A solenoid is actuable to independently move the first and second valves and thereby control the application of fluid pressures to first and second ends of a check assembly, in turn to control injection of fuel into an associated engine cylinder.

Abstract: Fuel pump for delivering high pressure fuel to a fuel injection system of an internal combustion engine is provided. The fuel pump has a body, a drive shaft rotatably mounted in the body, at least one cam on the drive shaft, a plurality of pumping plungers mounted in the body for movement in the radial direction relative to the axis of rotation of the drive shaft, a pumping chamber defined radially outwardly of each plunger, and a delivery valve associated with each pumping chamber. Each pumping plunger is mounted in a support member which provides sliding support for its associated plunger in the circumferential direction of the drive shaft over substantially the entire length of the plunger in all working positions thereof. Each plunger is coupled to at least one cam by a pin which is secured to the plunger and extends outwardly from the plunger through a slot which extends through the support member in the axial direction of the drive shaft.

Abstract: A fuel injector includes a valve member disposed at the upper end of the injector case adjacent a valve recess. The valve member includes a bore and a counterbore, and a tube having a bore is slidably disposed within the counterbore. The valve member bore and the tube bore define a fuel flow passage substantially coincident with the central axis of the injector. The valve member is spring biased to an open position to communicate fuel at transfer pump pressure to the valve recess. At the initiation of the injection cycle, an actuator, preferably an electrical solenoid, closes the valve against the spring force so that fuel is communicated along the central passage to a nozzle.

Abstract: An injector is disclosed which comprises a valve needle moveable within a bore of a nozzle body. The valve needle is engageable with a seating, and downstream of the seating, the nozzle body and valve needle together define a chamber. Passages communicate with the chamber to supply fuel from the chamber to outlet ports. The ports are located so as to be covered by the valve needle when the needle engages its seating, movement of the needle away from its seating beyond a predetermined distance uncovering the ports.

Abstract: An injector is disclosed which comprises a valve needle spring biased into engagement with a seating. The spring engages a spring abutment piston which defines, in part, a chamber which communicates, in use, with a spill valve, a restricted drain passage, and a fuel inlet. A non-return valve is located within the chamber and arranged to control communication between the chamber and the fuel inlet.

Abstract: The fluid treatment apparatus may comprise a sedimenter or agglomerator for insertion in a fuel line between a fuel tank and a fuel injection pump in order to remove dirt particles and water from diesel fuel passing along the fuel line. A water reservoir (4) is positioned at the bottom of the apparatus in order to collect the water removed from the fuel. In order to avoid applying a compressive clamping force to the side wall (17) of the water reservoir (4), the arrangement is such as to clamp only the top part of the side wall (17) ?as shown in FIG. 1! or else to apply no clamping force at all to the water reservoir (4) ?see FIG. 16!. This enables the water reservoir (4) to be made of cheap plastics material.

Abstract: An injector is disclosed which comprises a nozzle body arranged to receive fuel under pressure from a pumping chamber. An injection control arrangement in the form of a valve controls injection timing, and a drain control arrangement in the form of a valve controls communication between the pumping chamber and a fuel reservoir. An electromagnetic actuator controls operation of both valves, the actuator including a single, common armature which is associated with both of the valves.

Abstract: An injector comprises a body, a valve needle slidable within the body and biassed into engagement with a seating by a spring, a fuel supply line for supplying fuel to thrust surfaces provided on the valve needle to apply a force on the valve needle acting against the action of the spring, a drain valve operable to control communication between the supply line and a low pressure drain, a needle control valve controlling the fuel pressure within a control chamber defined, in part, by a surface of the valve needle or a component carried thereby oriented such that when high pressure fuel is applied to the control chamber, a force is applied to the valve needle in a direction assisting the spring, wherein the drain valve and the needle control valve are controlled by an electromagnetic actuator arrangement including a single armature, the needle control valve and the surface of the valve needle or component carried thereby defining part of the control chamber being of dimensions such that the needle control valve

Abstract: This invention relates to a fuel pump, and more particularly to a fuel pump for delivering high pressure fuel to a fuel injection system of an internal combustion engine. A fuel pump is provided comprising coupling means (30) mechanically coupling a first pump plunger (1) to a second drive means (14) and a second pump plunger (11) to a first drive means (4) whereby, when the first pump plunger (1) is driven by the first drive means (4) from bottom dead center to top dead center, the second pump plunger (11) is driven by the coupling means (30) from top dead center to bottom dead center, and as the second pump plunger (11) is driven from bottom dead center to top dead center by the second drive means (14), the first pump plunger (1) is driven from top dead center to bottom dead enter by the coupling means (30).

Abstract: A fuel injection system comprises a pumping plunger slidable within a bore and arranged to supply fuel to an injector nozzle. A spill valve communicates with the bore to control the fuel pressure applied to the nozzle. The nozzle includes a valve member biased into engagement with a seating by a spring, the spring engaging a piston member at least part of the end of which remote from the spring is exposed to the fuel pressure in the bore. The spill valve includes a flow connection which communicates by way of a restrictor with a drain. The restrictor is formed by the piston member and cylinder within which the piston member is slidable.