초록 ▼

A valve gear includes a valve (30), which controls a flow rate of a fluid and an opening of which is determined according to a rotational position of a valve element, an actuator (20) for providing a rotational force to a rotary valve shaft that changes the opening of the valve (30), and attaching/d

A valve gear includes a valve (30), which controls a flow rate of a fluid and an opening of which is determined according to a rotational position of a valve element, an actuator (20) for providing a rotational force to a rotary valve shaft that changes the opening of the valve (30), and attaching/detaching means. The attaching/detaching means includes a locking element (32) formed at its prescribed positions with locking concave/convex portions and an engaging element (22) formed at its prescribed positions with engaging concave/convex portions. The locking element (32) and the engaging element (22) are relatively rotatable around the rotary valve shaft up to a prescribed angle, and prevent the actuator (20) from coming off the valve (30) at an engaging position where the engaging concave/convex portions and the locking concave/convex portions are engaged with one another, and allow the actuator (20) and the valve (30) to be detached from each other at a disengaging position.

대표청구항 ▼

1. A valve gear comprising:a valve for controlling a flow rate of a fluid, an opening of the valve being determined according to a rotational position of a valve element; an actuator for providing a rotational force to a rotary valve shaft that changes the valve opening; and attaching/detaching mean

1. A valve gear comprising:a valve for controlling a flow rate of a fluid, an opening of the valve being determined according to a rotational position of a valve element; an actuator for providing a rotational force to a rotary valve shaft that changes the valve opening; and attaching/detaching means for detachably attaching said valve to said actuator, wherein said attaching/detaching means comprises a locking element formed at prescribed positions with locking concave/convex portions, and an engaging element formed at prescribed positions with engaging concave/convex portions, and a holding portion for holding said engaging element rotatably around the rotary valve shaft up to a prescribed angle, said locking element and said engaging element are relatively rotatable around said rotary valve shaft up to the prescribed angle, and said engaging element and said locking element prevent said actuator from coming off said valve at an engaging position where said engaging concave/convex portions and said locking concave/convex portions are engaged with one another, and allow said actuator and said valve to be detached from each other at a disengaging position where engagement between said engaging concave/convex portions and said locking concave/convex portions is released. 2. Attaching/detaching means for detachably attaching a valve, which controls a flow rate of a fluid and an opening of which is determined according to a rotational position of a valve element, to an actuator for providing a rotational force to a rotary valve shaft that changes the valve opening, comprising:a locking element formed at prescribed positions with locking concave/convex portions; an engaging element formed at prescribed positions with engaging concave/convex portions; and a holding portion for holding said engaging element rotatably around the rotary valve shaft up to a prescribed angle, wherein said locking element and said engaging element are relatively rotatable around said rotary valve shaft up to the prescribed angle, and said engaging element and said locking element prevent said actuator from coming off said valve at an engaging position where said engaging concave/convex portions and said locking concave/convex portions are engaged with one another, and allow said actuator and said valve to be detached from each other at a disengaging position where engagement between said engaging concave/convex portions and said locking concave/convex portions is released. 3. An actuator that is attachable to and detachable from a valve, for providing a rotational force to a rotary valve shaft that changes an opening of the valve, which controls a flow rate of a fluid and an opening of which is determined according to a rotational position of a valve element, said actuator comprising:an engaging element formed at prescribed positions with engaging concave/concave portions, wherein said engaging element is made rotatable around the rotary valve shaft up to a prescribed angle by a holding portion, wherein said engaging element is mounted on said valve and rotatable around said rotary valve shaft up to the prescribed angle relatively to a locking element formed at prescribed positions with locking concave/convex portions, and wherein said engaging element prevents said actuator from coming off said valve at an engaging position where said engaging concave/convex portions and said locking concave/convex portions of said locking element are engaged with one another, and allows said actuator to be detached from said valve at a disengaging position where engagement between said engaging concave/convex portions and said locking concave/convex portions is released. 4. A valve for controlling a flow rate of a fluid, wherein an opening of the valve is determined according to a rotational position of a valve element and the valve attachable to and detachable from an actuator for providing a rotational force to a rotary valve shaft that changes the valve opening, said valve comprising:a locking element formed at prescribed positions with locking concave/convex portions, wherein said locking element is rotatable around said rotary valve shaft up to a prescribed angle relatively to an engaging element mounted on said actuator and formed at prescribed positions with engaging concave/convex portions, wherein said engaging element is made rotatable around the rotary valve shaft up to the prescribed angled by a holding portion, wherein said locking element prevents said valve from coming off said actuator at an engaging position where the locking concave/convex portions and the engaging concave/convex portions of said engaging element are engaged with one another, and allows said valve to be detached from said actuator at a disengaging position where engagement between said locking concave/convex portions and said engaging concave/convex portions is released. 5. The valve gear according to claim 1, wherein said holding portion is adapted to be fixed to said actuator, and said locking element is adapted to be fixed to said valve.6. The attaching/detaching means according to claim 2, wherein said holding portion is adapted to be fixed to said actuator, and said locking element is adapted to be fixed to said valve.7. The actuator according to claim 3, wherein said holding portion is fixed to said actuator, and said engaging element is adapted to be engaged with and disengaged from said locking element that is fixed to said valve.8. The valve according to claim 4, wherein said holding portion is fixed to said actuator, and said locking element is fixed to said valve and adapted to be engaged with and disengaged from said engaging element.