| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission which can suppress the generation of an energy loss.SOLUTION: A hydraulic control circuit comprises: a first oil passage and a second oil passage which circulate hydraulic pressure to a gear change mechanism; an oil pump which supplies the hydraulic pressure to the first oil passage; an unload valve which is arranged in the first oil passage, and unloads oil in the first oil passage on the basis of set pressure; a check valve which can make the oil pass to only the second oil passage from the first oil passage; and an accumulator which is connected to the second oil passage, and accumulates the hydraulic pressure of the second oil passage. In the gear change mechanism, a gear change ratio is controlled by the hydraulic pressure which is supplied from the second oil passage, and a control part variably controls the set pressure of the unload valve on the basis of a gear change state of the gear change mechanism.SELECTED DRAWING: Figure 1 |
