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An air flow meter that includes a filter or flow rectifier disposed in a retaining aperture of a collar in a bypass channel such that a second end face of the filter rests against one end of a slide-in member in which a resistance element is held in position without any edges that disturb the air fl

An air flow meter that includes a filter or flow rectifier disposed in a retaining aperture of a collar in a bypass channel such that a second end face of the filter rests against one end of a slide-in member in which a resistance element is held in position without any edges that disturb the air flow in the remainder of the bypass channel. The air metering device is designed to be used to measure the air sucked into an air intake tube of an internal combustion engine.

대표청구항 ▼

An air metering device for metering an amount of air sucked in by an internal combustion engine via an air flow tube, comprising, a main flow channel member including a main flow channel having a large diameter end portion and a small diameter end portion, a flow tube (16) inserted into said large d

An air metering device for metering an amount of air sucked in by an internal combustion engine via an air flow tube, comprising, a main flow channel member including a main flow channel having a large diameter end portion and a small diameter end portion, a flow tube (16) inserted into said large diameter end portion and designed to form a Venturi-shaped flow zone of said main flow channel, a bypass formed between said Venturi-shaped flow zone and said large diameter end portion, said bypass including a bypass channel (27) having an inlet opening disposed upstream of a narrowest cross section of said Venturi-shaped flow zone, said bypass channel including therein, in series, in an air flow direction, a filter and a temperature-dependent measuring resistance downstream of said filter, a collar (20) that surrounds said filter in said bypass juxtaposed said inlet opening (28), said bypass channel including a first zone (29) formed in said collar (20) upstream of said filter, said bypass channel includes a second zone formed by said filter (30) and a third zone (34) formed in a slide-in member (33) which is in abutment with a downstream end of said filter and a downstream end abutment face (21) of aid collar (20); said abutment face (21) being oppositely directed with respect to the inlet opening (28) of the bypass channel (27), said temperature-dependent measuring resistance (35) being mounted in said third zone of said slide-in member (33), said filter (30) being held with its first end face (37) toward said inlet opening in a retaining opening (36) in said collar (20) in such a way that its second end face (38) directed towards said slide-in member (33) abuts against the slide-in member (33) and is axially secured by said slide-in member so that there is no airflow-distorting edge located between said second end face (38) of said filter and said temperature dependent measuring resistance (35).