HYDRAULIC CIRCUIT FOR TRANSMISSION

PROBLEM TO BE SOLVED: To provide a hydraulic circuit for a transmission making it possible to facilitate warm-up and improve friction of a lubrication part by compatibly satisfying an increase in throughput of a heat exchanger during low oil temperatures and a throughput of the lubrication part.SOLUTION: A hydraulic circuit 1 for a transmission includes: a lubrication part 7 as a lubrication part of the transmission; a heat exchanger 6 that is disposed upstream of the lubrication part 7 and heats a supplied oil during low oil temperatures; and a thermo valve 9 that is disposed on a branch oil passage 81 extending from between the heat exchanger 6 and the lubrication part 7, and adjusts a throughput of the branch oil passage 81 according to an oil temperature. 【課題】低油温時に熱交換器の通油量増加と潤滑部の通油量とを両立させることで、暖機促進及び潤滑部のフリクション改善を可能にする変速機の油圧回路を提供する。【解決手段】変速機の油圧回路１は、変速機の潤滑部である潤滑部７と、潤滑部７の上流に設けられ、供給されるオイルを低油温時に加熱する熱交換器６と、熱交換器６及び潤滑部７間からの分岐油路８１に設けられ、油温に応じて分岐油路８１の通油量を調節するサーモバルブ９と、を備える。【選択図】図１