Wastegate actuator and turbocharger having same

Abstract

The invention relates to an exhaust gas bypass actuating mechanism of a supercharger. The exhaust gas bypass actuating mechanism comprises a pull rod, a rocking arm and a locking piece, wherein the pull rod is hinged to the rocking arm, the locking piece is elastic, one end of the locking piece is connected to the rocking arm, and the other end of the locking piece is fixed to the pull rod so as to stabilize the relative position between the pull rod and the rocking arm. According to the exhaust gas bypass actuating mechanism, the locking piece which is made of elastic materials is additionally arranged on the bypass actuating mechanism so as to generate axial pretightening force on the pull rod, so that the knocking problem is improved, and noise is reduced; the change of a bypass valve actuating mechanism is less, so that the cost is low; and the locking piece is suitable for various bypass actuating mechanisms of similar structures and has the advantage of high applicability.

Description

technical field [0001] The invention relates to the technical field of engine turbines, in particular to a waste gas bypass actuator and a turbocharger with the mechanism. Background technique [0002] With the widespread use of automobiles, people have higher and higher requirements for the performance of automobile engines, and turbochargers have been used more and more widely as an effective means to improve engine power, economy, and emissions. Due to the complex structure and high cost of variable cross-section turbochargers, and the simple structure, reliability and effectiveness of turbochargers with bypass valves, turbochargers with bypass valves are commonly used at present, and with bypass valves The turbocharger mainly controls the pull rod through the actuator, and then drives the rocker arm to drive the valve to swing, so as to realize the switch of the wastegate valve. [0003] At present, in the process of processing, there is inevitably a gap between the coo...

AI Technical Summary

Problems solved by technology

[0004] In the matching structure where the movement of the rocker pin is controlled by the tie rod, there is an axial gap and a radial gap between the pin hole of the tie rod and the rocker pin, which may easily cause the pull rod to vibrate in the axial direction and cause knocking during operation. At the same time, the pin hole of the actuator tie rod is easy to wear and deform after a long time of work, and the radial fit clearance of the hole shaft is further enlarged. The resonance of the bypass mechanism is generated, which affects the accuracy of the opening size of the exhaust flow channel and the size of the bypass valve switch, and at the same time generates noise, which further reduces the working stability of the actuator

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