| 摘要 |
PURPOSE:To ensure sufficient oil pressure in braking force generating portions at all times by providing a pilot operated type shut-off valve between the output port of the hydraulic cylinder of a pressure intensifier which converts a pneumatic signal into a hydraulic pressure and sends out same as a hydraulic signal and a slide preventing valve which is connected to the port. CONSTITUTION:A pressure intensifier 5 which converts a pneumatic signal Bca based on a brake specifying signal into a hydraulic pressure to send out same to braking force generating portions 4 has a pneumatic cylinder 10 to which pressure air is fed/discharged through a feeding/discharging port 6 and a hydraulic cylinder 13 consisting of an oil cylinder chamber 11 into which the piston rod 8a of the pneumatic cylinder 10 is fitted and an oil tank 12. A selector valve 19 is connected to the port 16a of a valve chamber 16 on the rear end of the pneumatic cylinder 10, the feeding/discharging port 6, and a detecting port 18 and the inside passage condition thereof is varied accompanying the reciprocation of the piston 8. A shut-off valve 40 is provided between the output port 14 of the oil cylinder chamber 11 and a slide preventing valve 15 and operated by a pressure air fed to the pilot chamber 19c of the selector valve 19. |
