| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a pump device capable of ensuring a sufficient amount of discharge.SOLUTION: A pump device comprises: a first piston 45 axially moving in a pump accommodation hole 43a by driving an eccentric cam to rotate; a second piston 46 disposed in series to the first piston 45; a first spring 47 interposed between the first piston 45 and the second piston 46; a second spring 48 interposed between the second piston 46 and a bottom 44a and higher in spring force than the first spring 47; a first compression chamber 60 defined by the first piston 45 and the second piston 46; a second compression chamber 61 defined by the second piston 46 and the bottom 44a; a communication passage 46a communicating the first compression chamber 60 with the second compression chamber 61; and a check valve 58 closing the communication passage 46a if a volume of the first compression chamber 60 decreases, the second piston 46 cooperating with the first piston 45 after the check valve 58 closes the communication passage 46a to compress the second compression chamber 61 and to discharge a brake fluid to outside.</p> |
