Patent · US Expired

Electrically controllable valve

US4494727A · kind A · utility

10Cited by

5References

9Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Rudolf Babitzka · Kirchberg, DE
Walter Beck · Schwieberdingen, DE
Ernst Linder · Mühlacker, DE

Key dates

Filing date	Oct 15, 1981
Grant date	Jan 22, 1985
Priority date	—
Expiry date	Oct 15, 2001

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02M2200/502
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

To provide for extremely short valve operating time periods, in the order of up to 10.sup.-5 seconds, for example, a valve element (3, 33, 53, 63, 73, 93) is slidable within a bore (2, 52), movable by a spring (10, 60) or by applied hydraulic pressure (P), and restrained from movement by an electrical positioning element (14, 44, 45, 94) which has a positioning movement transverse to the movement of the valve element, and which clamps the valve element in the bore, or an extending flap or strip (34) against a counter element, which may be another positioning element (45). Preferably, and for fast operation, the positioning element (14) is a stack or column (15) of piezoelectric disks (16) which, when energized, push a stem or bolt element (13) in clamping direction towards the valve stem; alternatively, (FIG. 6), the positioning element (94) can be a solenoid coil pushing the armature (93) thereof into clamping direction towards the valve stem.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.