| 摘要 |
PROBLEM TO BE SOLVED: To prevent an increase of driving force and the abrasion and damage of a sliding face by setting the positional relation of the action point of the driving force to the neutral face of the force existing at the position expressed by a specific equation consisting of the distance between both sliding faces of a valve element and the frictional forces generated on both sliding faces. SOLUTION: The neutral face H of the frictional force R1 between a rotor side adhesive face 5A and a stator side adhesive face 6E and the frictional force R2 between a rotor side sliding face 5B and a case side sliding face 1D is located at a position shown by the expression L.R2/R1+R2 apart from the adhesive face 5A side, where L is the thickness of a valve element. The rocking range of a drive shaft is set so that the action point of the driving force passes on the neutral face H, which is located at a position nearly at the center of the valve element thickness L or slightly near the adhesive faces 5A, 6E side when fluid lubrication is used and at a position about 1/4 of the valve element thickness L from the adhesive faces 5A, 6E when a solid lubricating film is used on the adhesive face side and the fluid lubrication is used on the sliding face side, or the action point is located between the neutral face H and the sliding faces 5B, 1D having the large frictional force R2.
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