US 12,460,659 B2
Hydraulic cylinder
Koutaro Asano, Tokyo (JP); Keisuke Tasaki, Tokyo (JP); and Yuki Ikezawa, Tokyo (JP)
Assigned to KOMATSU LTD., Tokyo (JP)
Appl. No. 18/683,265
Filed by Komatsu Ltd., Tokyo (JP)
PCT Filed Aug. 10, 2022, PCT No. PCT/JP2022/030566
§ 371(c)(1), (2) Date Feb. 13, 2024,
PCT Pub. No. WO2023/053737, PCT Pub. Date Apr. 6, 2023.
Claims priority of application No. 2021-162097 (JP), filed on Sep. 30, 2021.
Prior Publication US 2024/0344535 A1, Oct. 17, 2024
Int. Cl. F15B 15/14 (2006.01)
CPC F15B 15/1447 (2013.01) [F15B 15/149 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A hydraulic cylinder comprising:
a cylinder tube;
a piston rod that has a rod end portion disposed inside the cylinder tube and moves in an axial direction;
a first rod passage that is formed inside the piston rod and connects a hydraulic source and a first opening formed in the rod end portion;
a plug that is inserted into the first rod passage through the first opening; and
a piston that is fixed to the piston rod in a state of covering from one side in the axial direction at least a part of the plug and partitions an inside of the cylinder tube into a bottom chamber on one side in the axial direction and a head chamber on the other side in the axial direction.