| 摘要 |
PROBLEM TO BE SOLVED: To provide a vacuum pump which reduces exhaust noise by relaxing pressure fluctuation due to pulsation of discharge gas, of which cost is low, which occupies a small space in mounting on a vehicle, and which has high vibration proof properties.SOLUTION: This vacuum pump includes: a piston 12 reciprocatably inserted in an inner circumference surface 11a of a cylinder 11; a drive means 30 disposed in a drive chamber 36 and reciprocating the piston 12; working chambers 20 formed in the piston 12, the cylinder 11 and a cylinder head 5; an intake valve 13 and an exhaust valve 14 connected to each working chamber 20. In the vacuum pump, a discharge gas channel 11d leading discharge gas of the working chamber 20 to the drive chamber 36 through the exhaust valve 14 is disposed in a cylinder wall 11c forming an inner circumference surface 11a of the cylinder 11, and the drive chamber 36 communicates to the atmosphere through a drive chamber side exhaust port 41b, equipment chamber 46, and a relaxing chamber side exhaust port 41c disposed at the equipment chamber 46 in sequence. |
