US 11,988,233 B2
Working cylinder
Josef Bueter, Haren/Altenberge (DE)
Assigned to Buemach Engineering International B.V., TA Emmen (NL)
Appl. No. 17/775,439
Filed by Bümach Engineering International B.V., TA Emmen (NL)
PCT Filed Nov. 6, 2020, PCT No. PCT/DE2020/000269
§ 371(c)(1), (2) Date May 9, 2022,
PCT Pub. No. WO2021/089071, PCT Pub. Date May 14, 2021.
Claims priority of application No. 20 2019 004 569.4 (DE), filed on Nov. 8, 2019.
Prior Publication US 2022/0397130 A1, Dec. 15, 2022
Int. Cl. F15B 15/14 (2006.01); B23K 26/28 (2014.01); F15B 15/17 (2006.01)
CPC F15B 15/1442 (2013.01) [B23K 26/28 (2013.01); F15B 15/17 (2013.01); F15B 2215/30 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A working cylinder, comprising:
a cylinder tube, a first closure part, a second closure part and a piston unit;
said cylinder tube having a first cylinder tube end and a second cylinder tube end;
said first closure part being arranged at the first cylinder tube end and said second closure part being arranged at said second cylinder tube end, said cylinder tube and said first and second closure parts define a cylinder interior;
said piston unit defining at least one working chamber in said cylinder interior, said piston unit slidably passing through the first closure part;
said first closure part being joined to the cylinder tube in a positive-locking manner by a first circumferential laser ring weld seam, said second closure part being joined to the cylinder tube in a positive-locking manner by a second circumferential laser ring weld seam, and each of the laser ring weld seams defining a fluid-tight sealing plane, each of the laser ring weld seams having a ring weld seam depth, said ring weld seam depth having a ratio of 1.1 to 2.5 relative to a cylinder tube wall thickness;
a first circumferential sealing ring being arranged axially spaced from said first laser ring weld seam in said cylinder interior between said first closure part and a cylinder tube inner wall of said cylinder tube at said first cylinder tube end, said sealing ring defining a first pressure-separated annular section between said first circumferential sealing ring and said first laser ring weld seam, and/or a second circumferential sealing ring being arranged at an axial distance from the second laser ring weld seam in the cylinder interior between the second closure part and said cylinder tube inner wall at said second cylinder tube end, and said second circumferential sealing ring defining a second pressure-separated annular section arranged between said second circumferential sealing ring and said second laser ring weld seam.