Measuring and testing – Volume or rate of flow – By measuring thrust or drag forces
Patent
1981-09-29
1983-07-12
Gill, James J.
Measuring and testing
Volume or rate of flow
By measuring thrust or drag forces
73118, 123494, G01F 128
Patent
active
043923860
ABSTRACT:
A flow rate meter is proposed which serves to ascertain the quantity of a flowing medium, in particular the quantity of air aspirated via an air intake tube by an internal combustion engine. The flow rate meter includes a measuring body which is pivotable counter to a restoring force about a bearing shaft supported in the housing in accordance with the quantity of the medium flowing therethrough. The flow rate meter further includes a damping body which is likewise pivotable about the bearing shaft and defines a damping chamber in the form of a movable wall, with respect to the flow conduit. The measuring body and the damping body are coupled rigidly to one another by means of crosspieces. The invention comprehends embodiments wherein either the damping body or the measuring body is directly connected with a hub held in a rotationally fixed manner on the bearing shaft. The housing wall about the hub is provided such that a leakage gap formed between the housing wall and the hub terminates at one end outside the damping chamber downstream of the measuring body. As a result, the harmful effects on the measuring competence of the flow rate meter which would be caused by air flowing via the leakage gap are avoided; thus, even very small flowing air quantities such as occur at low engine rpm levels can still be measured accurately.
REFERENCES:
patent: 4073189 (1978-02-01), Draper
patent: 4147146 (1979-04-01), Wessel et al.
patent: 4184466 (1980-01-01), Nagele
patent: 4346589 (1982-08-01), Kienzle et al.
Knetsch Manfred
Romann Peter
Chapman, Jr. J.
Gill James J.
Greigg Edwin E.
Robert & Bosch GmbH
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