| 摘要 |
A system for a continuously variable transmission has a line pressure control valve (40) having a spool (42), a first hydraulic circuit having a pump (21) for supplying oil to the transmission through the line pressure control valve (40). A second hydraulic circuit is provided for supplying oil to the line pressure control valve (40) so as to shift the spool (42). A flow rate control valve (80) is provided in the second hydraulic circuit for regulating flow rate of oil passing therein to a constant value, and a reducing valve (60) provided in the second hydraulic circuit at a downstream position of the flow rate control valve (80) so as to produce a constant pressure of oil. The constant pressure is regulated by a control valve (65) so as to shift the spool of the line pressure control valve (40), thereby controlling line pressure. |
