Double Cylinder Type Hydraulic Mechanism

Abstract

A hydraulic mechanism includes an outer cylinder having an expansion side working port and a contraction side working port respectively formed on a top of the outer cylinder; an inner cylinder insertedly installed inside the outer cylinder to come in and out toward a bottom of the outer cylinder; an inner rod having two flow paths respectively connected to the expansion side working port and the contraction side working port, one end of which is fixed to an inner top surface of the outer cylinder, and the other end of which passes through a top of the inner cylinder and protrudes to be positioned inside the inner cylinder; and a piston combined with the other end of the inner rod to be positioned inside the inner cylinder and formed with a hole connected to the flow path of the inner rod connected to the expansion side working port.

1 . A double cylinder type hydraulic mechanism comprising:
 an outer cylinder  101  having an expansion side working port  106  and a contraction side working port  107  respectively formed on a top of the outer cylinder;   an inner cylinder  102  insertedly installed inside the outer cylinder  101  so as to come in and out toward a bottom of the outer cylinder  101 ,   an inner rod  103  having two flow paths respectively connected to the expansion side working port  106  and the contraction side working port  107 , one end of which is fixed to an inner top surface of the outer cylinder  101 , and the other end of which passes through a top of the inner cylinder  102  and protrudes to be positioned inside the inner cylinder  102 ; and   a piston  104  combined with the other end of the inner rod  103  to be positioned inside the inner cylinder  102  and formed with a hole connected to the flow path of the inner rod  103  connected to the expansion side working port  106 .   
     
     
         2 . The mechanism according to  claim 1 , further comprising:
 an inner cylinder seal  108  installed inside an upper hole of the inner cylinder  102  in order to support lateral loads applied in a radius direction of the cylinder and prevent leakage of working fluid from the upper hole of the inner cylinder  102  through which the other end of the inner rod  103  slidingly penetrates;   a piston seal  109  installed on an outer surface of the piston  104  in order to support the lateral loads applied in the radius direction of the cylinder and prevent leakage of the working fluid between the upper and lower spaces of the inner cylinder  102  partitioned by the piston  104 ; and   an outer cylinder seal  110  installed on an inner surface of the outer cylinder  101  in order to support the lateral loads applied in the radius direction of the cylinder and remove foreign materials attached on an outer surface of the inner cylinder  102 .