Abstract: A damping force generating device for an oil damper including a hydraulic cylinder, a sub-tank having in the interior thereof an oil chamber and a gas chamber, and a first oil passage which hydraulically connects the hydraulic cylinder to the oil chamber. The damping force generating device comprises a valve seat having second and third oil passages for passing therethrough an operating oil when it is flowing in first and second directions of the first oil passage, respectively; a first valve for opening and closing the second oil passage; and a second valve for opening and closing the third oil passage. The first or second valve comprises a valve body, a mechanism for normally urging the valve body in a closing direction, and an urging force adjusting arrangement for adjusting the urging force of the urging mechanism from the exterior. The damping force generating device is simplified in structure and provides for a reduction in size of the oil damper as well as facilitated adjustment of the damping force.

Abstract: An oil pressure shock absorber wherein an outer cylinder is coaxially fitted to the outside of an inner cylinder in which a piston having oil holes for generating a damping force is connected with the inner cylinder at the lower ends through oil holes and is fixed to the inner cylinder at the upper ends through a rod guide in which the piston rod is slidably fitted so as to be in sliding contact with the above mentioned piston rod so that an auxiliary seal and main seal of a resilient material tightly sealing the outer cylinder may be arranged in turn on the upper side of the rod guide. An annularly arranged oil reservoir is provided between the auxiliary seal and main seal and is connected with a gap enclosed with the piston rod and the main and auxiliary seals.