Patent ID: 8348797

Claim:
A transmission comprising: first, second, third, and fourth clutches being engageable in response to fluid pressure; a main passage, a first passage, a second passage, and a third passage; a pump configured to supply fluid pressure to the main passage; a first valve linking the first clutch and the first passage, and configured to control fluid communication between the first clutch and the first passage; a second valve configured to control fluid communication between the second clutch and the second passage; a third valve configured to control fluid communication between the third clutch and the third passage; a fourth valve configured to control fluid communication between the fourth clutch and the main passage; and fifth and sixth valves configured to control fluid communication between the main passage and the first, second, and third passages such that the fifth and sixth valves selectively provide a first operating condition in which the first passage is not in fluid communication with the main passage and the second and third passages are in fluid communication with the main passage, a second operating condition in which the second passage is not in fluid communication with the main passage and the first and third passages are in fluid communication with the main passage, and a third operating condition in which the third passage is not in fluid communication with the main passage and the first and second passages are in fluid communication with the main passage.