Patent ID: 8596481

Claim:
A clutch oil reservoir cap including a head and a body, comprising: an operation valve slidably mounted in the head and forming a first space and a second space, wherein the first space is formed between the head and an upper surface of the operation valve and the second space is formed between the head and a lower surface of the operation valve; an intake hole formed in the head and the operation valve, wherein the intake hole comprises (i) a first hole formed at a portion of the head and communicating the first space and an outside of the clutch oil reservoir cap, (ii) a second hole formed in a side of the head and connected to the first space, and (iii) a third hole formed in the operation valve and connected to the second space, wherein the second hole and the third hole are selectively communicated according to the pressure difference in the first space and the second space for balancing the pressure therebetween; and an exhaust opening formed in the head and exhausting air of the second space to the outside of the head; wherein the operation valve selectively opens or closes the exhaust opening and the intake hole according to a pressure difference between the first space and the second space, wherein the operation valve includes a first protrusion portion that is upwardly protruded in the operation valve and the third hole is formed therein.