| 摘要 |
<p>PURPOSE:To fulfil the function of adjusting pressure in a reservoir always at a steady state by a simple construction cap provided with a thin material valve which makes possible to correct the positive or negative pressure in the reservoir. CONSTITUTION:When the level of brake fluid in a reservoir 1 rises on account of ambient temperature rise, pressure in the reservoir rises and becomes positive. This positive pressure acts on a thin material valve 17 through an air vent 15 and opens a valve port 18. As this valve port 18 is opened, the positive pressure is released outside in a moment, the reservoir inside 19 becomes equal to atmospheric pressure, and the valve port 18 is closed. On the other hand, when the level of brake fluid falls owing to ambient pressure drop, pressure in the reservoir space 19 becomes negative. Consequently, a pressure difference occurs between a chamber 14 and a space 25, and atmospheric pressure in the space 25 acts on the thin material valve 17 and opens the valve port 18. As this valve port 18 is opened, atmospheric pressure enters into the reservoir in a moment and the valve port 18 is closed again.</p> |
