Claims
- 1. A fluid flow control rotary valve comprising:
- a resinous housing forming a valve chamber with a plurality of ports disposed at a longitudinally central portion of an inner periphery thereof;
- a metal collar having openings at positions corresponding respectively to said ports and enclosing said valve chamber, said metal collar being made of a resilient plate member having a pair of opposite ends with a space formed therebetween, said opposite ends being elastically deformed so that said metal collar is press-fitted to said resinous housing due to resiliency of said metal collar, irrespective of a difference in thermal expansion between said metal collar and said housing;
- a pair of ball bearings fitted into opposite ends of an inner periphery of said metal collar;
- a rotary shaft rotatably supported by said pair of ball bearings;
- a valve body carried by said rotary shaft and disposed in said metal collar, said valve body for changing at least an opening area of said ports; and
- biasing means disposed in said valve chamber, for biasing said pair of ball bearings toward a portion of said inner periphery of said housing at which one of said opening areas to be changed is disposed, said biasing means restricting a change in clearance between said valve body and said portion of said inner periphery of said housing due to thermal expansion.
- 2. A fluid flow control rotary valve according to claim 1, wherein:
- said biasing means comprises resilient projections formed integrally with said collar where said pair of ball bearings are fitted.
- 3. A fluid flow control rotary valve according to claim 2, wherein:
- said collar comprises a cylindrical member having a pair of opposite ends with a space formed therebetween, said opposite ends being elastically deformed and closely fitted to said inner periphery of said resinous housing.
- 4. A fluid flow control rotary valve for driving a valve body by supplying electric current to a coil, said fluid flow control valve comprising:
- a resinous housing forming a valve chamber having circumferentially formed intake and outlet ports, said resinous housing accommodating said valve body and having a coil chamber which accommodates said coil;
- a metal collar having openings at positions corresponding respectively to said intake and outlet ports and covering said valve chamber, said metal collar being made of a resilient plate member having a pair of opposite ends with a space formed therebetween, said opposite ends being elastically deformed so that said metal collar is press-fitted to said resinous housing due to resiliency of said metal collar, irrespective of a difference in thermal expansion between said metal collar and said housing;
- a pair of ball bearings fitted into opposite ends of an inner periphery of said metal collar;
- a rotary shaft rotatably supported by said pair of ball bearings;
- a valve body on said rotary shaft and disposed in said metal collar, said valve body for changing at least an opening area of said inlet and outlet ports; and
- biasing means disposed in said valve chamber, for biasing said pair of ball bearings toward a portion of said inner periphery of said metal collar at which a said opening area to be changed is disposed to restrict a change in clearance between said valve body and said portion of said inner periphery of said collar.
- 5. A fluid flow control rotary valve according to claim 4, wherein:
- said biasing means comprises a resilient project integral with said metal collar.
- 6. A fluid flow control rotary valve according to claim 4, wherein said metal collar comprises:
- a cylindrical member having a pair of opposite ends with a space formed therebetween, said opposite ends being elastically deformed and closely fitted to an inner periphery of said resinous housing thereby forming said biasing means.
Priority Claims (1)
Number |
Date |
Country |
Kind |
6-016594 |
Feb 1994 |
JPX |
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Parent Case Info
This is a continuation of application No. 8/530,197, filed as PCT/JP95/00157 Feb. 7, 1995 published as WO95/22023 Aug. 17, 1995 which was abandoned upon the filing hereof.
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Continuations (1)
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Number |
Date |
Country |
Parent |
530197 |
Sep 1995 |
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