Abstract: An actuator includes a piezoelectric stack within a housing that applies a compressive load to the stack. The housing may include a cylindrical tube closed at one end and may seal the stack against fluid pressure. The housing may be shorter than the length of the piezoelectric stack and may include resilient means for inducing elastic strain in the stack. The resilient means may include one or more slots extending around the circumference of the housing and/or a corrugated region of the housing to form a tension spring at a lower end of the housing. The tension spring may then serve to draw the stack into compression. The stack may include a plurality of layers of piezoelectric or piezoceramic material interspersed with a plurality of layers of electrically conductive material and connecting means for connecting the layers to a source of electrical power.

Abstract: An actuator includes a piezoelectric stack within a housing that applies a compressive load to the stack. The housing may include a cylindrical tube closed at one end and may seal the stack against fluid pressure. The housing may be shorter than the length of the piezoelectric stack and may include resilient means for inducing elastic strain in the stack. The resilient means may include one or more slots extending around the circumference of the housing and/or a corrugated region of the housing to form a tension spring at a lower end of the housing. The tension spring may then serve to draw the stack into compression. The stack may include a plurality of layers of piezoelectric or piezoceramic material interspersed with a plurality of layers of electrically conductive material and connecting means for connecting the layers to a source of electrical power.

Abstract: An object of the present invention is to obtain a consistently stable needle lift damping effect in an injector 8b for fuel injection. In an injector 8b that relieves fuel pressure inside a pressure control chamber 37 and lifts a needle valve 36, there are provided a damper member 62 that is slidably mounted to the needle valve 36, a damping chamber 63 formed between the damper member 62 and the needle valve 36, a leak passage 64 for extracting and leaking out the fuel in the damping chamber 63, and a stopper member 41 to restrict the lift position of the damper member 62. Damping of the lift of the needle valve 36 is carried out by extracting and leaking out the fuel in the damping chamber 63 through the leak passage 64. The needle valve 36 functions as a guide for the damper member 62, and prevents vibration of the damper member 62, allowing a consistently stable damping effect to be obtained.

Abstract: The invention relates to an injection valve (10) for the fuel injection in a internal combustion engine, in particular in a diesel engine. The injection valve (10) has a holder body (20) in which a first passage (30) is formed. At the holder body (20) a nozzle body (40) of an injection nozzle (16) is secured in which a second passage (54) is formed which is connected to the first passage (30) and which together with the latter forms a fuel infeed line for the injection nozzle (16). Moreover, a closure mechanism (60) is provided for the closing off of the injection nozzle (16). A sleeve (74) serves for the sealing off of the connection point between the first and the second passage (30, 54).

Abstract: The invention relates to a switching valve (10) comprising a valve body (20) in which a flow passage (24) is formed which opens with its one end into a work space (42). A valve plate (44) is accommodated in the work space (42) and can be moved between a closure position and an opening position. A closure element (50) is arranged between the valve plate (44) and the opening (26) of the flow passage (24) and closes the latter when the valve plate (44) is located in its closure position.

Abstract: The invention relates to a fuel injection apparatus, in particular for diesel engines, comprising at least one injection nozzle which is connected to a fuel pressure line and which has a nozzle element which can be actuated through a control unit for the opening and the closing of the injection nozzle, with the control unit comprising a piston which is displaceably journalled in a control passage, which is coupled at its one end to the nozzle element and which bounds with its other end together with a plug which is arranged in the control passage a pressure chamber which can be connected up to the fuel pressure line via a supply passage and which communicates with an outflow passage, with it being possible to vary the pressure in the pressure chamber through the release or the interruption of the flow through the outflow passage for the actuation of the nozzle element when the pressure chamber is connected via the supply passage to the fuel pressure line, and with it being possible to influence the flow throu