| 摘要 |
An accumulator (28) for an anti-lock brake system includes a valve body portion (31) defining an accumulator chamber (30), an accumulator piston (38) slidably disposed within the accumulator chamber (30), a spring (58), and a cover (42). The accumulator chamber (30) has a fluid inlet (32) for connection to a source of pressurized fluid at a first end of the chamber (30). The chamber (30) has a second end (36) open to atmosphere. The accumulator piston (38) separates the first end (32) of the chamber (30) from the second end (36) of the chamber (30). The spring (58) is disposed in the accumulator chamber (30) between the piston (38) and the second end (36) of the chamber (30) and biases the piston (38) toward a first position. The cover (42) closes the connection between the second end (36) of the chamber (30) and atmosphere and has micro-porous structure. The micro-porous structure is configured to block water molecules and to pass constituent molecules of air, thereby enabling air to be communicated across while preventing the intrusion of water into the chamber through the second end (36).
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