US 12,215,723 B2
Fluid pressure cylinder
Tatsuya Itou, Nagano (JP); Nobuyuki Kobayashi, Nagano (JP); and Hirotaka Kobayashi, Nagano (JP)
Assigned to KYB CORPORATION, Tokyo (JP)
Appl. No. 18/292,429
Filed by KYB Corporation, Tokyo (JP)
PCT Filed Apr. 25, 2022, PCT No. PCT/JP2022/018718
§ 371(c)(1), (2) Date Jan. 26, 2024,
PCT Pub. No. WO2023/007890, PCT Pub. Date Feb. 2, 2023.
Claims priority of application No. 2021-123341 (JP), filed on Jul. 28, 2021.
Prior Publication US 2024/0218889 A1, Jul. 4, 2024
Int. Cl. F15B 19/00 (2006.01); F15B 15/14 (2006.01); F15B 20/00 (2006.01); F16J 1/12 (2006.01)
CPC F15B 19/005 (2013.01) [F15B 15/1452 (2013.01); F15B 15/1457 (2013.01); F15B 15/149 (2013.01); F15B 20/00 (2013.01); F16J 1/12 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A fluid pressure cylinder comprising:
a cylinder tube;
a piston rod inserted within the cylinder tube reciprocatably;
a piston member connected to a tip end of the piston rod, the piston member being configured to define a fluid pressure chamber in the cylinder tube;
a rod inner passage provided within the piston rod, the rod inner passage being configured such that a first opening portion opens at an outer circumferential surface of the piston rod in the cylinder tube, and such that a second opening portion opens outside the cylinder tube; and
a sensor part provided outside the cylinder tube, the sensor part being configured to detect that working fluid is guided to the rod inner passage, wherein
the piston member is connected to the piston rod in a state in which one-side end surface of the piston member is in contact with an annular step portion so as to block the first opening portion of the rod inner passage, the annular step portion being provided on the outer circumferential surface of the piston rod, and
the sensor part is configured to detect that the working fluid is guided to the rod inner passage from the fluid pressure chamber through a gap between the step portion and the piston member.