Patent ID: 9534652
Date: 2017-01-03
CPC Classifications: B62K,F16F

Claim:
1. A shock absorber comprising: a push rod; a first piston connected to an end of the push rod; a cylinder configured to receive the push rod and the first piston; a piston rod received within and fastened to the cylinder; a second piston connected to an end of the piston rod, the end of the piston rod adjacent to the push rod; and a third piston slidably positioned around the piston rod; wherein the cylinder and the first piston cooperatively define a first oil cavity; wherein the second piston, the first piston, and the cylinder cooperatively define a second oil cavity; wherein the second piston, the third piston, and the cylinder cooperatively define a third oil cavity; wherein the third piston and the cylinder cooperatively define a gas cavity configured to house a gas; wherein the second oil cavity is communication with the first oil cavity and the third oil cavity; wherein the first oil cavity, the second oil cavity, and the third oil cavity are configured to contain hydraulic oil and are in fluidic communication with one another; wherein the first piston is configured to urge the hydraulic oil of the second oil cavity to flow into the first oil cavity and the third oil cavity in event the push rod is pushed; wherein the third piston is configured to compress the gas in the gas cavity in event the third piston is urged toward the gas cavity, thereby creating a damping effect; wherein the push rod comprises a main body defining a first through hole along a center axis, a first fastening member connected to the main body, and a first end cover configured for sealing the main body; the first piston is connected to the first fastening member, the first end cover comprises a main part and a first sealing rod passing through the main part, and an end of the first sealing rod is inserted into the first through hole; wherein the main body of the push rod comprises a first oil hole, a first auxiliary rod and a first adjusting rod received in the first through hole, the first oil hole passes through opposite sidewalls of the main body, the first auxiliary rod is positioned between the first sealing rod and the first adjusting rod, and the position of the first adjusting rod is adjusted by what length of the first sealing rod is inserted into the first through hole; wherein a second through hole is defined in the first fastening member and passes through the first fastening member along a center axis, and the second through hole is in communication with the first oil hole and the first through hole to make the first oil cavity communicate with the second oil cavity; and wherein a flow of hydraulic oil through the first oil hole and the second through hole is controlled by the first adjusting rod.