摘要 |
PROBLEM TO BE SOLVED: To provide a brake system of a transmission capable of efficiently cooling a friction plate with a relatively simple structure.SOLUTION: A transmission brake system 100 comprises: a friction plate set 110 in which fixed-side friction plates 111 and rotation-side friction plates 112 are alternately disposed; and a piston 116 disposed on one side in an axial direction of the friction plate set 110, the fixed-side friction plates 111 each including a lubricating oil passage going around within the fixed-side friction plate 111; a lubricating-oil introduction port introducing lubricating oil; and a lubricating-oil supply port 111d opening in a facing surface 111e on which the fixed-side friction plate 111 faces the rotation-side friction plate 112, closed by the rotation-side friction plate 112 when the brake system 100 is fastened, and supplying the lubricating oil flowing in the lubricating oil passage to the rotation-side friction plate 112 when the brake system 100 is not fastened. |