US 12,253,118 B2
Hydraulic clutch and work-vehicle travel power transmission apparatus including the hydraulic clutch
Hidetoshi Hana, Sakai (JP); Atsushi Jinnai, Sakai (JP); Tomonari Tsuchida, Sakai (JP); Ryoma Iwase, Sakai (JP); Yosui Nishijima, Sakai (JP); and Naoyuki Miyamoto, Sakai (JP)
Assigned to KUBOTA CORPORATION, Osaka (JP)
Filed by KUBOTA CORPORATION, Osaka (JP)
Filed on Dec. 12, 2023, as Appl. No. 18/537,175.
Claims priority of application No. 2022-201429 (JP), filed on Dec. 16, 2022.
Prior Publication US 2024/0200614 A1, Jun. 20, 2024
Int. Cl. F16D 25/12 (2006.01); F16D 21/06 (2006.01); F16D 25/0638 (2006.01); F16D 25/10 (2006.01)
CPC F16D 25/123 (2013.01) [F16D 25/0638 (2013.01); F16D 25/10 (2013.01); F16D 2021/0607 (2013.01); F16D 2021/0661 (2013.01)] 8 Claims
OG exemplary drawing
 
8. 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;
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;
the clutch body includes, in the interior thereof:
a clutch piston to press and release the first clutch plates and the second clutch plates;
a return spring to return the clutch piston to a release position; and
a stopper to receive and support the return spring;
the stopper includes an inserted portion inserted into the interior of the clutch hub; and
the injection port extends through the inserted portion.