Patent ID: 9440319
Filing Date: 2016-09-13
CPC Classification: B23P,B60T,F15B,F16J,Y10T

Claim Text:
1. A seal assembling method of a master cylinder for assembling a cup seal for sealing a piston slidably moving in a bottomed-tubular cylinder main body to a seal groove formed in the cylinder main body in an annular shape using an insertion jig, the seal assembling method of the master cylinder comprising: mounting the cup seal on the outer periphery of a shaft of a section of a center cored bar tool while inclining the cup seal with respect to an axial direction of the shaft section, wherein the center cored bar tool includes the shaft section and a head section, the outer diameter of the head section being larger than the outer diameter of he shaft section; inserting the center cored bar tool into the cylinder main body in a state where the cup seal is mounted on the center cored bar tool with the cup seal inclined with respect to the axial direction of the shaft section; moving one side of the cup seal in the radial direction to an insertion limit of the cup seal in a state where a position of the head section of the center cored bar tool for defining the insertion limit of the cup seal with respect to the cylinder main body is aligned with the seal groove, wherein the insertion jig is a pair of semi-tubular bodies constituted by a first semi-tubular body and a second semi-tubular body, the one side of the cup seal in the radial direction is inserted into the seal groove using the first semi-tubular body, and the one side of the cup seal in the radial direction is close to the seal groove; moving the other side of the cup seal in the radial direction to the insertion limit using the second semi-tubular body in a state where the one side of the cup seal in the radial direction is pressed by the first semi-tubular body and the head section of the center cored bar tool; and assembling the cup seal to the seal groove, wherein the head section of the center cored bar toll passes through the inside of the cup seal which is assembled in the seal groove.