Air flow measuring device

Patent metadata

Field	Value
Publication number	US-9689358-B2
Application number	US-201514696699-A
Country	US
Kind code	B2
Filing date	Apr 27, 2015
Priority date	Apr 28, 2014
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

A second sensor includes a lead wire and is exposed to intake air flowing through a passage outside a housing. A conduction body is conductively-joined to the wire. A lead hole opens on an exposed surface, and the wire or the conduction body is pulled out of the passage through the hole. A predetermined terminal is conductively-joined to the wire or the conduction body which is pulled out through the hole. A mold part is provided by injection-molding from resin fluid to seal a conductively-joined part between the wire or the conduction body and the predetermined terminal. The hole is filled up with a filler material to limit leakage of intake air from the passage. A high resilient part has higher resilience than the filler material and is located between the filler material and the mold part to receive injection pressure at time of the injection-molding of the mold part.

First claim

What is claimed is:

1. An air flow measuring device adapted to project into a passage for intake air drawn into an internal combustion engine, for producing a signal in accordance with a flow rate of the intake air in the passage, the air flow measuring device comprising:
a housing that defines an internal passage which takes in a part of the intake air flowing through the passage and through which the taken-in intake air passes, wherein the housing includes an exposed surface which is exposed to the intake air flowing through the passage;
a first sensor that projects into the internal passage to produce the signal in accordance with the flow rate of the intake air in the passage;
a second sensor that includes a lead wire and is exposed to the intake air flowing through the passage outside the housing, wherein the second sensor produces a signal separately from the first sensor;
a conduction body that is conductively joined to the lead wire of the second sensor;
a lead hole which is a hole opening on the exposed surface and through which the lead wire or the conduction body is pulled out of the passage;
a predetermined first terminal that is conductively joined to the lead wire or the conduction body which is pulled out through the lead hole;
a mold part that is provided by injection-molding from resin fluid to seal a conductively-joined part between the lead wire or the conduction body and the predetermined first terminal;
a filler material with which the lead hole is filled up to limit leakage of the intake air from the passage; and
a high resilient part that is provided to have higher resilience than the filler material and is located between the filler material and the mold part to receive injection pressure at time of the injection-molding of the mold part.

2. The air flow measuring device according to claim 1 , further comprising:
a processing circuit that performs predetermined processing on the signal produced by the first sensor and outputs the processed signal; and
a predetermined second terminal, wherein:
the first sensor is integrated by resin together with the processing circuit and the predetermined second terminal to constitute one assembly; and
a conductively-joined part between the predetermined second terminal included in the one assembly and another terminal is sealed by the mold part.

Assignees

• Denso Corp

Inventors

• Sudou Akiyuki

Classifications

• F02D41/187

  using a hot wire flow sensor · CPC title

• G01F1/69

  of resistive type · CPC title

• F02M35/10386 Primary

  for flow rate (air flow meters in air cleaners F02M35/021; circuit arrangements for generating control signals by measuring intake air flow F02D41/18) · CPC title

• G01F5/00

  Measuring a proportion of the volume flow · CPC title

• G01F1/6842

  with means for influencing the fluid flow · CPC title