| 摘要 |
PURPOSE:To decrease a pressure angle of cam and improve accuracy of measurement eliminating shocks and wear, by forming an inscribing cam on which a cam roller attached on the trailing end of blade rolls on the inside surface cut out of top end bottom covers. CONSTITUTION:Upon introducing liquid from an inlet port 2, dynamic pressure of liquid is applied on a blade 9b to bring a rotor 7 into rotation and a cam roller 11 attached to the blade 9a rolls along a inscribing cam 14 allowing the blade 9a to proceed from the inside of rotor 7 to outside and thus, a measuring chamber is formed by mutually neighboring blades 9a, 9b, a major are surface 1a of the main body 1 and rotor 7. When the rotor 7 begins to rotate from this condition, the blade 9b, a recedes into the rotor 7 inside a displacing groove 8. On the other hand, another blade 9d positioned to face against the blade 9b begins to be separated from a minor arc surface 1b of the main body 1 and outward acting force, contary to the blade 9b, works, advancing forward inside the displacing groove 8, beginning to form the next measuring chamber. |
