Claims
- 1. A motor-operated exhaust gas recirculation control comprising a rotor shaft reciprocating with rotating motion of a motor, and a valve head movable to open and close an orifice with the reciprocating motion of said rotor shaft,wherein said valve comprises a motor, a valve body for supporting said valve head, and a body joining said motor and said valve body together and having a cooling water passage formed therein, and the outer race of said ball bearing is held in place by said body, wherein an end face of an outer race of a ball bearing is held in place through a washer in the axial direction of said rotor shaft, wherein the washer is a wave washer arranged to form a heat insulating space between the outer race of the bearing and the body joining said motor and said valve body together.
- 2. A motor-operated exhaust gas recirculation control valve according to claim 1, wherein a cooling water passing through said cooling water passage is a cooling water for an internal combustion engine.
- 3. A motor-operated flow control valve comprising a rotor shaft reciprocating with rotating motion of a motor, and a valve head movable to open and close an orifice with the reciprocating motion of said rotor shaft, whereina rotor unit of said motor comprises a magnet, a single ball bearing and a magnet holder for supporting said magnet and an inner race of said ball bearing, said ball bearing having an outer race held fixed under a preload, between a case of said motor and a body holding said motor, a small gap existing between an upper axial end of said motor case and said single ball bearing and a axial end face of a socket portion being equal to or smaller than an amount of relative movement between said inner and outer races of said single ball bearing in a thrust direction.
- 4. A motor-operated flow control valve according to claim 3, wherein said magnet holder is formed by insert molding, and said magnet and inner race of said single ball bearing are inserted in said magnet holder.
- 5. A motor-operated flow control valve according to claim 4, wherein an end face of said race of said single ball bearing is held in place through a washer in the axial direction of said rotor shaft.
- 6. A motor-operated flow control according to claim 3, wherein an end face of said race of said single ball bearing is held in place through a washer in the axial direction of said rotor shaft.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8-190525 |
Jul 1996 |
JP |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/897,307, filed Jul. 21, 1997, issued as U.S. Pat. No. 6,089,536, Jul. 18, 2000.
US Referenced Citations (11)
Foreign Referenced Citations (2)
Number |
Date |
Country |
7-190227 |
Jul 1995 |
JP |
7-190226 |
Jul 1995 |
JP |
Continuations (1)
|
Number |
Date |
Country |
Parent |
08/897307 |
Jul 1997 |
US |
Child |
09/431925 |
|
US |