Hydraulic clutch and work-vehicle travel power transmission apparatus including the hydraulic clutch

A hydraulic clutch comprising:

• a clutch body;
• a tubular clutch hub located inside a tubular clutch plate support section included in the clutch body;
• a plurality of first clutch plates to be locked to the clutch plate support section and arranged in a direction extending along a rotation axis of the clutch body;
• a plurality of second clutch plates to be locked to the clutch hub and arranged in the direction extending along the rotation axis;
• oil supply holes extending through the clutch hub to supply lubricating oil from an interior of the clutch hub toward the first clutch plates and the second clutch plates;
• and
• an injection port to allow injection of the lubricating oil into the interior of the clutch hub;
• wherein
• the injection port is located in the interior of the clutch hub at a location between the clutch hub and the rotation axis;
• and
• the clutch hub includes an inner circumferential portion including:
• an opposing portion opposing the injection port;
• and
• a first portion closer to a first end portion of the clutch hub than the opposing portion in the direction extending along the rotation axis, the first portion including an inclined inner circumferential surface structured such that a radius of the clutch hub decreases toward the first end portion.