Abstract: A hydraulic damper including an inner cylinder, an outer cylinder, a space between the inner and outer cylinders, first and second end walls in the inner cylinder, a piston rod extending only through the first end wall and supported therein by a ball bearing assembly, a first portion of the piston on one side of the first end wall and within the inner cylinder, a second portion of the piston on the opposite side of the first end wall and external to the inner cylinder, a piston head on the first portion of the piston rod within the inner cylinder, a first chamber in the inner cylinder between the piston head and the first end wall, a second chamber in the inner cylinder between the piston head and the second end wall, an accumulator in communication with the second chamber, a fluid-containing seal between the first end wall and the second portion of the piston rod, and a closed fluid circuit between the accumulator and the fluid-containing seal through the space between the inner and outer cylinders.

Abstract: A hydraulic damper including a cylinder and a piston rod and a seal for the piston rod and a metal bellows fixedly mounted between the cylinder and the piston rod for accepting leakage of hydraulic fluid from the cylinder, and a spring arrangement encircling the cylinder and piston rod, the spring arrangement consisting of two equal length, equal size springs wound in opposite directions with their outer ends fixed to the cylinder and piston rod and having their inner ends bearing against each other to eliminate the application of torque from the springs to the bellows.