Support structure of valve shaft for butterfly valve
AssigneeNissan Motor Co., Ltd.
InventorAtsurou Kotouge
Life of this patent
Estimating the term…
Abstract
A butterfly valve assembly includes a valve shaft supported by a bearing so as to rotate around its longitudinal axis and having a first end and a second end, an actuator connected to the first end of the valve shaft, and a valve-opening sensor connected to the second end of the valve shaft and having a return spring therein that applies a force to the valve shaft perpendicularly to its longitudinal axis. The return spring disposed in the valve-opening sensor continuously applies its resilient force to both ends of the valve shaft in one direction, so that the valve shaft can be restricted in its free movement within the bearing, therefore the rattling noise, due to the vibration of the valve shaft within the bearing, can be prevented.
Claims12
A butterfly valve assembly comprising:
- a valve shaft supported by a bearing so as to rotate around its longitudinal axis and having a first end and a second end;
- an actuator connected to said first end of said valve shaft;
- and
- a valve-opening sensor connected to said second end of said valve shaft and having a sensor shaft, which is supported by a support so as to rotate around its longitudinal axis, and a return spring disposed in said valve-opening sensor;
- a first free movement of said valve shaft in said bearing into which said first end of said valve shaft is inserted;
- and
- a second free movement of said sensor shaft within a play where said sensor shaft is supported by said support,
- wherein said return spring applies a rotational force to said valve shaft and said sensor shaft to restrict said first free movement at said first end of said valve shaft and said second free movement, respectively.
A butterfly valve assembly comprising:
- a valve shaft rotatable around its longitudinal axis and having a first end and a second end;
- an actuator connected to said first end of said valve shaft;
- a first linkage device providing a connection between said first end of said valve shaft and said actuator;
- and
- a valve-opening sensor connected to said second end of said valve shaft and having a sensor shaft, which is supported by a support so as to rotate around its longitudinal axis, and a return spring disposed in said valve-opening sensor;
- a first free movement of said first linkage device within a play at said connection between said first end of said valve shaft and said actuator;
- and
- a second free movement of said sensor shaft within a play where said sensor shaft is supported by said support,
- wherein said return spring applies a rotational force to said valve shaft and said sensor shaft to restrict said first free movement and said second free movement, respectively.
Dependencies are inferred from the claim text.