| 主权项 |
1. In a vehicle having a brake line communicating a brake pressure to a brake, a lubrication control circuit for controlling flow of lubrication fluid to a brake cooling circuit, the lubrication control circuit comprising:
a lube pressure control proportional valve having an outlet, an inlet connected to a lube fluid pressure source, and a pressure control valve member movable to a a second position opening communication between the inlet and the outlet, a pressure control pilot line operable to urge the pressure control valve member to its second position, and a control valve biasing member which urges the pressure control valve member to its first position, wherein the pressure control pilot line is connected to the lube fluid pressure source; and a shuttle valve having an inlet connected to the outlet of the lube pressure control valve, a first outlet connected to the brake cooling circuit, a second outlet connected to a final drive lube circuit, a shuttle valve member movable to a first position wherein the first and second outlets are communicated with the inlet of the shuttle valve, and movable to a second position wherein the first outlet is communicated with the inlet of the shuttle valve and the second outlet is blocked, a resilient member which is biased to urge the shuttle valve member to its first position, and a shuttle valve pilot line connected to the brake line, the shuttle valve pilot line urging the shuttle valve member to its second position to provide flow to the brake cooling circuit and block flow to the final drive lube circuit during a brake event. |
