Electric air flow control device for internal combustion engines

Abstract

The purpose of this invention is to achieve an electric air flow control device comprising a motor rotor bearing structure having excellent wear resistance even with loads from striking caused by a high vibrational environment specific to an internal combustion engine. A cylindrical sintered metal slide bearing is used in at least one of a front bearing (16) and a rear bearing (17) that support a rotor shaft (14) of a motor (3) that is the rotary control drive source of a throttle valve (7) that controls the intake air flow to an internal combustion engine, and the bearing design is such that the relationship of the radial crushing strength and the compressive deformation rate of the cylindrical sintered metal bearing has the mechanical properties of a maximum radial crushing strength of 230 N / mm2 or greater and a maximum compressive deformation rate of 3.5% or greater at the maximum radial crushing strength.

Description

technical field [0001] The present invention relates to an electric air flow control device, which is disposed in an intake passage of an internal combustion engine and appropriately controls the amount of intake air supplied to the internal combustion engine. Background technique [0002] Regarding the driving control of automobiles, electronic control of various components is widely used. Regarding the amount of intake air supplied to the internal combustion engine, there is also the following trend: after converting various operating conditions into electrical signals, electric motors that control according to the optimal electrical signal The type air flow control device is standardized instead of the mechanical air flow control device that mechanically controls the driver's depressing amount of the accelerator pedal through a connection structure such as a wire. [0003] In addition, in recent years, exhaust regulations for environmental protection have become stricter ...

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Problems solved by technology

[0005] Even if the throttle valve for air flow control is controlled to open and close from the position where the passage is completely closed to the state where the passage is completely open, the rotational angle of the throttle valve is about 90°, and the rotation of the motor that provides the driving force is generally Around 4 weeks, it cannot rotate continuously at high speed like traditional motors

[0006] In addition, if considering the continuous and constant driving state such as the expressway, although it is accompanied by a small opening and closing control of the throttle valve corresponding to the acceleration operation, the driving motor is only subjected to a small positive force close to the degree of almost a stop state. reverse rotation control

(Although the balance force for maintaining the throttle valve opening to ensure the target operating state depends on the motor, compared with the motors used in general industrial equipment, the continuous rotation operation is equivalent to no

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