GB636670A - Improvements in or relating to rotary hydraulic shock absorbers and wing shaft assemblies for the improved hydraulic shock absorbers - Google Patents

Abstract

636,670. Rotary hydraulic shock-absorbers. HOUDAILLE-HERSHEY CORPORATION. Aug. 16, 1946, No. 24444. Convention date, Dec. 29, 1945. [Class 108 (iii)] A rotary hydraulic shock-absorber comprises a wing shaft carrying vanes or wings cooperating with a housing assembly to provide working chambers intercommunicating through an axial blind end bore.in the wing-shaft, the bore being closed at the inner end and providing a valve-housing pocket opening towards the outer end of the wing-shaft, a valve body within the pocket having a metering passage for fluid displacement under normal fluid pressure produced by the vanes, and blow-off passages in the valve body controlled by checkvalve assemblies. In the construction shown, in which the section is taken at two planes intersecting in the central axis of the wingshaft at an angle of less than 180 degrees, a housing 12 is divided into four chambers 17, 17<SP>1</SP> (not shown), 18, 18<SP>1</SP> (not shown), by rotatable wings or vanes 11 and 11<SP>1</SP> integral with a boss 58, and two diametrically-positioned, fixed partitions (not shown), integral with an upper wall member 13. The chambers 17, 17<SP>1</SP> are diametrically opposed and constitute compression chambers and communicate through ports 27, 27<SP>1</SP> in the boss 58 with a recess 28 in a valve 25 disposed within the hollow interior 23 of an operating shaft 10 to which the boss 58 is splined. An axial groove 29 in the periphery of the valve 25 forms a metering orifice which connects the recess 28 with a recess 30 in the valve 25 which is connected with the chambers 18, 18<SP>1</SP> (which comprise rebound chambers) by ports 31, 31<SP>1</SP>. The recesses 28, 29 are also connected by blowoff passages 33, 41, having spring-loaded ballvalves 37, 45 controlling maximum compression and rebound pressures respectively. The valve 45 is loaded by a spring 47, the outer abutment of which is axially adjustable by a screw-plug 52 to vary the rebound blow-off pressure. In a modified construction (Fig. 6, not shown), the ball-valves are replaced by semi-spherical members integral with a stepped shankportion on which the valve-loading spring seats. A cover 19 defines with the wall member 13, a reservoir space 20, connected with the working chambers by a ball-valve 21.