Importance

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Abstract

A throttle valve includes a one-piece valve body defining a transverse flow passage and an actuation device cavity. The throttle valve includes a valve assembly having a shaft which extends through the flow passage and which is mounted to the valve body via a pair of aligned passages formed in the walls of the valve body defining the flow passage. One of the aligned passages establishes communication with the actuation device so as to enable the valve shaft to be assembled to the valve body through the actuation device cavity. A pole carrier is mounted to the valve shaft and a pair of pole members are secured to the pole carrier. An electromagnetic actuation device is mounted within the actuation device cavity and is operable on the pole members in a contactless manner to impart rotation to the valve shaft through the pole members and the pole carrier upon energization of a coil assembly associated with theelectromagnetic actuation device. A portion of the valve shaft extends from the valve body opposite the actuation device cavity, and a stop arrangement and sensor arrangement are interconnected with the valve shaft. The stop arrangement preferably includes stop structure formed integrally with the valve body and a stop member secured to the valve shaft. The sensor arrangement is a contactless assembly which includes a Hall-effect sensor assembly having a stationary portion mounted to the valve body and a rotatable portion engaged with the valve shaft so as to detect the position of the valve assembly relative to the valve body. Inputs from the sensor arrangement are provided to a controller, which is operable to control the position of the valve member by controlling the energization of the electromagentic actuation device, to thereby control the position of the valve member. The invention contemplates a number of improvements in the overall construction of the valve assembly and its components, as well as in the method by which the throttle valve is assembled. The valve shaft assembly is driven, and its position is sensed, in a contactless manner so as to reduce friction and provide increased life.

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First Claim