Hydrauliksteuerkreis für hydraulisch betätigtes Fahrzeuggetriebe

摘要

A hydraulic control circuit for a hydraulically operated vehicular transmission (1) has at least five forward transmission trains (G1 - G5). The hydraulic control circuit is made up of three sets of first through third solenoid valves (171, 172, 173) and three sets of first through third shift valves (10, 11, 12) to be controlled for changeover by the three sets of solenoid valves (171, 172, 173) such that each of the transmission trains is established by changeover combinations of each of the shift valves (10, 11, 12). The first shift valve (10) controls a condition of communication between an oil supply passage (L1, L3) which is in communication with a hydraulic oil pressure source (7) and a first oil passage (L8) and a second oil passage (L11) which are both on a downstream side of the oil supply passage (L1, L3). The second shift valve (11) controls a condition of communication between the first oil passage (L8) and a third oil passage (L10) which is on a downstream side of the first oil passage (L8) and also controls a condition of communication between the second oil passage (L11) and a fourth oil passage (L12) and a fifth oil passage (L13, L14) which are both on a downstream side of the second oil passage (L11). The third shift valve (12) controls a condition of communication between the fifth oil passage (L13, L14) and a sixth oil passage (L15) and a seventh oil passage (L16) which are both on a downstream side of the fifth oil passage (L13, L14).