Pressure regulation control valve for an hydraulic control system of an automatic power transmission

• Main Authors: MOUTTET; ANDRE, LEORAT; FRANCOIS JEAN-LOUIS
• Format: Patent
• Language: English
• Published: 27.05.1975
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; LIGHTING; MECHANICAL ENGINEERING; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; THERMAL INSULATION IN GENERAL; WEAPONS

A pressure regulation control valve having a body including at least first and a second flow ways for communication with friction devices of a hydraulic control system of an automatic power transmission mechanism, a distributor differential spool member slidable in the body for feeding said flow ways, an inlet communicating with a pressure fluid pump outlet through a flow restriction device, and outlets communicating with the friction devices operated through a selector valve, the inlet of the restriction device being connected simultaneously to a first end face of the distributor spool member and to the inlet of the first flow way communication, and the outlet of the restriction device being connected to a second end face of the distributor spool member, the distributor in a first initial position being in abutment on said valve body under action exerted by the pressure fluid on the first and second faces of the distributor spool, the two flow ways being then obstructed; the distributor in an intermediate position due to the action of fluid pressures on the first and second faces and on a third intermediate face of the distributor spool, permitting a regulated pressure to be obtained in the first flow way communication, the second flow way communication still being obstructed; the distributor spool member in its third final position, due to the action of pressure fluid on the three faces of the distributor spool member, permitting the aperture of both the first and second flow way communications.