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Description
The present invention relates to a thermal air flow meter that measures a flow rate of air, and for example, relates to a thermal air flow meter that is mounted on an intake pipe of an internal combustion engine to measure a flow rate of intake air supplied to the engine.
Background of the invention
A thermal air flow meter that measures the flow rate of the intake air supplied to the internal combustion engine is installed in a part of the intake system of the internal combustion engine and used. The thermal air flow meter has a configuration in which a flow rate detecting element such as a heating resistor is heated, and the flow rate of the passing air is measured based on the amount of heat released to the air. Therefore, it is necessary to consider protecting the flow detecting element and ensuring the accuracy of the flow measuring to avoid the influence of fouling or the like under long-term use. Further, in the intake pipe of the internal combustion engine, the intake air flow rate is arranged to pulsate down as the intake and exhaust valves of the engine are opened and closed, and it is necessary to consider the intake pulsation such as the reverse flow generated when the intake pipe resonates.
Therefore, in the conventional thermal air flow meter used in the internal combustion engine, as described in Patent Document 1, the flow rate detecting element is disposed in the sub air passage to protect the flow rate detecting element from contamination or The influence of countercurrent, etc. Moreover, in recent years, from the viewpoint of purification of exhaust gas and improvement of fuel consumption rate, high-precision measurement of intake air flow rate is required, and there is a need for a hot air that can accurately measure backflow generated in the intake pipe. Flow meter.
Since the thermal air flow meter also measures the reverse flow in a state in which the detecting element is disposed in the sub air passage, the sub air passage of the thermal air flow meter is required to have a complicated structure such as a curved passage portion or a throttle shape. On the other hand, from the market point of view, the cost of the thermal air flow meter is also required to be reduced. That is, it is necessary to overcome the problem that the cost is reduced while requiring a complicated structure.
When the sub air passage is complicated, the number of structural members increases, and there is a proposal to form a sub air passage by combining the above-described structural members. However, an increase in the number of components leads to an increase in cost, and in order to achieve cost reduction, it is necessary to constitute a complicated structure without increasing the number of components. In this way, in addition to reducing the component cost, the assembly man-hour can be reduced, and the cost of the thermal air flow meter can be reduced or the cost can be suppressed.
Summary of the invention
The present invention has been made in view of the above-described aspects, and an object of the invention is to provide a thermal air flow meter capable of suppressing deformation during molding of a base member and ensuring dimensional accuracy and dimensional change with little influence on measurement accuracy, and capable of accurately measuring air flow rate.
A thermal air flow meter of the present invention which solves the above problems includes a casing member disposed in an intake passage of an internal combustion engine, and a plate-like base member fixed to the casing member and having air for passing through the intake passage. a part of the inflowing sub-path; a flow detecting element disposed in the sub-path; and a circuit board electrically connected to the flow detecting element, inputting a heat radiation amount of the flow detecting element, and outputting a signal corresponding to the air flow rate, the hot air flow The base member is made of a synthetic resin material, and has a substrate fixing portion that fixes the circuit board, and a sub-pass structure portion that is formed integrally with the front end portion of the substrate fixing portion, and passes through the housing The members cooperate to constitute a sub-passage; the reinforcing structure is provided at least at a joint portion between the substrate fixing portion and the sub-pass structure portion to increase the strength of the base member. 
Figure 3 is a diagram of a conventional base member of the present invention
According to the thermal air flow meter of the present invention, the base member is made of a synthetic resin material, and the substrate fixing portion having the fixed circuit board is formed integrally with the front end portion of the substrate fixing portion, and is formed integrally with the case member. The auxiliary passage structure of the passage, the reinforcing structure provided at least at the joint portion between the substrate fixing portion and the sub passage structure portion to increase the strength of the base member, and the strength of the flat base member by the reinforcing structure.
Therefore, even when a state in which the heat shrinkage difference is uneven between the thin portion and the thick portion is formed during the molding of the base member, it is possible to suppress the base member which is generated at the boundary between the thick portion and the thin portion. The warp deformation, wherein the base member has a substrate fixing portion made of a thin portion having a substantially constant resin thickness, and a sub passage forming portion having a thick portion in order to form a sub passage.
Therefore, it is possible to prevent the problem of mounting to the case member due to warping deformation and the problem of mounting of the circuit board, and to prevent unevenness in measurement accuracy of the flow meter.
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Thermal air flow meter
There is no limit to creativity, and the instrument is invented. Today we introduce a patent for the invention of a national invention - a thermal air flow meter . The patent was filed by Hitachi Automotive Systems Co., Ltd. and was issued an authorization announcement on April 5, 2017.