| 摘要 |
PURPOSE:To enable parking brake condition to be released by a simple operation equipping a switch valve for releasing parking brake located selectively in two positions. CONSTITUTION:When released condition is obtained by pushing a parking button 30A, a hand operated switch valve 30 is moved and situated in non-parking brake position and kept in such non-parking brake position by the pressurized fluid from a main pressurized fluid tank 26. A main hand operated fluid pressure passage 36a and a hand operated fluid pressure passage 38a are connected to each other. The pressurized fluid in the main pressurized fluid tank 26 is supplied into the fluid pressure chamber 16 of a fluid pressure cylinder mechanism 4 through a main hand operated fluid pressure passage 36a, a hand operated fluid pressure passage 38a, a fluid pressure passage 46 and a fluid pressure passage 50. Accordingly, an output shaft 12 is contracted, while opposing the pressure of a spring member 14, and the contact condition between a brake part 6 and a propeller shaft is released, whereby the parking brake device 2 becomes non- parking brake condition. |
