Patent ID: 6698559
Filing Date: 2004-03-02
Classification: B62K,F16F

Abstract:
A hydraulic damping device comprising:a cylinder with an inner space, a top end, a bottom end and an axial direction; a top cap and a bottom cap respectively attached to the top end and the bottom end of the cylinder; a rod moveably extending through the bottom cap and into the inner space in the cylinder; a piston securely attached to the rod and received in the cylinder to divide the inner space in the cylinder into a first chamber and a second chamber, the piston having multiple first channels defined through the piston and communicating with the first chamber and the second chamber in the cylinder and multiple second channels defined through the piston and communicating with the first chamber and the second chamber in the cylinder, wherein each first channel has a diameter larger than a diameter of each second channel; a working fluid contained in the inner space of the cylinder at an original pressure; a seal moveably mounted on the rod, received in the second chamber and abutting against the piston to close the first channels in the piston; a first biasing member with a resiliency connected to the rod to provide a recoil force to the rod; and a second biasing member with a resiliency mounted on the rod to provide a force to push the seal to abut against the piston, wherein the resiliency of the second biasing member is smaller than the resiliency of the first biasing member.