Gas filling apparatus and method for gas shock absorber

A gas filling method for filling a gas in the base shell assembly of the shock absorber, comprising the steps of:

• correcting an assembly location of a tube assembly and a rod guide in order to fix a predetermined position thereof;
• clamping a base shell assembly transferred to a gas filling unit;
• lowering the gas filling unit primarily for sealing top of the base shell assembly by a calking jig;
• lowering a rod chucking unit for letting a bolt portion of a rod enter into a collet;
• lowering a collet housing device for chucking the bolt portion of the rod by the collet;
• letting the oil seal break away from top of the base shell assembly, thereby lifting the rod chucking unit;
• filling a gas between the oil seal and the top of the base shell assembly;
• lowering the gas filling unit secondarily for inserting the oil seal into the top of the base shell assembly and simultaneously, calking primarily the top of the base shell assembly by a calking projection projected to inside of the calking jig;
• and
• calking secondarily the base shell assembly that is calked primarily, thereafter separating it from the gas filling unit.