A retaining unit that retains a stack body in which piston rings are stacked in an axial direction, a cutting-out unit that delivers a piston ring at the tip end of the stack body from the stack body, and a detecting unit that detects a boundary between the piston rings that are adjacent to each other in the stack body are included, and the cutting-out unit includes a moving unit that moves a pushing-out unit and a restricting unit, and after inserting the pushing-out unit and the restricting unit into a dividing portion that is a boundary between the piston ring at the tip end and a piston ring that is adjacent to the piston ring at the tip end in the stack body, in a state in which movement of the piston ring that is adjacent to the piston ring at the tip end in a delivering direction in which the piston ring at the tip end is delivered is restricted by the restricting unit, the moving unit moves the pushing-out unit in the delivering direction, so that the piston ring at the tip end is separated from the stack body, and the piston ring at the tip end is delivered along the retaining unit.

A method of manufacturing a component and a component manufacturing apparatus to attach an attached part in a predetermined posture to a ring-shaped channel formed in an outer circumference of a component main body. While being held by holding portions, a ring-shaped seal body is placed in contact with a tapered portion and has its diameter expanded to at least the outer diameter of the component main body. The seal body elastically deforms from the expanded-diameter state so that its diameter reduces and is attached to the attachment channel in the outer circumferential surface of the component main body while being guided by the holding portions.

A piston ring installation jig is to be used when installing a piston ring having a ring gap in a ring groove formed in an outer peripheral surface of a piston. The piston ring installation jig includes a main body including a groove. The main body has in a semi-cylindrical shape surrounding the outer peripheral surface of the piston. The groove has a substantially semicircular arc shape, and is formed in an inner peripheral surface of the main body in a region corresponding to the ring groove of the piston. A portion of the piston ring in a circumferential direction is inserted into the groove. The groove has a shape of an arc of a circle which has a circle center biased more to an outer peripheral side of the main body than a circle center of an inner peripheral surface of the main body.

A method of manufacturing a component and a component manufacturing apparatus attach an attached part in a predetermined posture decided in advance to a ring-shaped channel formed in an outer circumference of a component main body. While being held by holding portions, a ring-shaped seal body is placed in contact with a tapered portion and has its diameter expanded to at least the outer diameter of the component main body. The seal body elastically deforms from the expanded-diameter state so that its diameter reduces and is attached to the attachment channel in the outer circumferential surface of the component main body while being guided by the holding portions.

A piston ring installation jig is to be used when installing a piston ring having a ring gap in a ring groove formed in an outer peripheral surface of a piston. The piston ring installation jig includes a main body including a groove. The main body has in a semi-cylindrical shape surrounding the outer peripheral surface of the piston. The groove has a substantially semicircular arc shape, and is formed in an inner peripheral surface of the main body in a region corresponding to the ring groove of the piston. A portion of the piston ring in a circumferential direction is inserted into the groove. The groove has a shape of an arc of a circle which has a circle center biased more to an outer peripheral side of the main body than a circle center of an inner peripheral surface of the main body.

An auxiliary device for installing piston rings is described, which includes a mounting base, a transmission device, a connecting rod and a bracing structure. The mounting base includes a platform, an opening hole and an accommodating space. The transmission device is disposed in the accommodating space and includes a guide screw rod, a sliding base and a motor. The sliding base is slidably screwed on the guide screw rod. The motor can drive the guide screw rod to move the sliding base. The connecting rod is disposed on the sliding base. An external diameter of the piston ring while being put around the connecting rod is greater than an inner diameter of the opening hole. The bracing structure is disposed on the connecting rod. An external diameter of the bracing structure is getting greater from one end connected to the connecting rod. The bracing structure can accommodate the piston.

An auxiliary device for installing piston rings is described, which includes a mounting base, a transmission device, a connecting rod and a bracing structure. The mounting base includes a platform, an opening hole and an accommodating space. The transmission device is disposed in the accommodating space and includes a guide screw rod, a sliding base and a motor. The sliding base is slidably screwed on the guide screw rod. The motor can drive the guide screw rod to move the sliding base. The connecting rod is disposed on the sliding base. An external diameter of the piston ring while being put around the connecting rod is greater than an inner diameter of the opening hole. The bracing structure is disposed on the connecting rod. An external diameter of the bracing structure is getting greater from one end connected to the connecting rod. The bracing structure can accommodate the piston.

A retaining unit that retains a stack body in which piston rings are stacked in an axial direction, a cutting-out unit that delivers a piston ring at the tip end of the stack body from the stack body, and a detecting unit that detects a boundary between the piston rings that are adjacent to each other in the stack body are included, and the cutting-out unit includes a moving unit that moves a pushing-out unit and a restricting unit, and after inserting the pushing-out unit and the restricting unit into a dividing portion that is a boundary between the piston ring at the tip end and a piston ring that is adjacent to the piston ring at the tip end in the stack body, in a state in which movement of the piston ring that is adjacent to the piston ring at the tip end in a delivering direction in which the piston ring at the tip end is delivered is restricted by the restricting unit, the moving unit moves the pushing-out unit in the delivering direction, so that the piston ring at the tip end is separated from the stack body, and the piston ring at the tip end is delivered along the retaining unit.