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AssigneeSiemens Aktiengesellschaft
InventorsAndreas Kappel, Randolf Mock, Hans Meixner
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The compensation element is compensating for temperature-conditioned length changes of an object. An injection valve that is fully functional in the entire range of the operating temperatures of a motor requires a device that compensates thermally conditioned length changes of the mechanical components (piezo-electric actuator, valve lifter, housing, etc.). This device should be capable of absorbing great forces and allow a stiff bearing of the actuator. The compensation element (3) has an oil-filled chamber (21) is composed of an actuator-side upper part (18), of a lower part (19) supported on a stiff bearing (valve housing 17), and of a structure (annular seal element 20) sealing the chamber (21) and yielding in an axial direction. Since the compensation element (3) is fitted into an annular holder (4) with little lateral play, every temperature-conditioned change of the oil or, respectively, chamber volume results in a displacement of the upper housing part (18) in an axial direction that is proportional to the volume change. As a result of a corresponding dimensioning of the chamber height, temperature-conditioned length changes of the valve housing (4) and of the piezo-electric actuator (2) can be compensated using the extremely compactly constructed and comparatively rigid compensation element (3).
A device having a housing having a housing chamber with a first support surface, a drive object disposed in the chamber and having an actuator extending out of the chamber opposite to the first support surface, the improvement being a compensation element disposed in the chamber between an end of the drive object and the first surface, said compensation element having a hermetically tightly sealed chamber filled with an expandable material and having means restricting lateral expansion so that all expansion occurs in an axial direction to compensate for differences in thermal expansion between the housing and the drive object.
A compensation element for compensating a temperature condition length change of a drive object relative to a housing having a housing chamber in which the drive object is disposed, said chamber having a support surface at one end, said compensation element being positioned in series between the drive object and the support surface and comprising an expandable chamber hermetically sealing an expandable medium therein, a lateral mechanical spring rate C.sub.lateral and an axial mechanical spring rate C.sub.axial of the compensation element meet the condition C.sub.lateral /C.sub.axial .gtoreq.10.sup.2 to 10.sup.3 given a non-filled expandable chamber, said compensation element having a lateral mechanical stiffness greater than the axial stiffness so that all volume changes of the medium occur in the axial direction and the lateral dimensions of the expandable chamber remaining constant.
A compensation element for compensating a temperature condition length change of a drive object relative to a housing having a housing chamber in which the drive object is disposed, said chamber having a support surface at one end, said compensation element being positioned in series between the drive object and the support surface and comprising an expandable chamber hermetically sealing an expandable medium therein, said compensation element having first and second parts forming the expandable chamber, said first part being supported on the support surface and the second part being guided displaceable in a direction of the longitudinal axis of the drive object, said compensation element having a lateral mechanical stiffness greater than the axial stiffness so that all volume changes of the medium occur in the axial direction and the lateral dimensions of the expandable chamber remaining constant.
Dependencies are inferred from the claim text.