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1. (WO2018104763) METHOD OF MANUFACTURING VARIABLE-DISPLACEMENT PISTONS

Pub. No.:    WO/2018/104763    International Application No.:    PCT/IB2016/002026
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Wed Dec 07 00:59:59 CET 2016
IPC: F04B 27/08
F04B 39/00
F04B 53/14
B23P 15/10
Applicants: MAHLE INTERNATIONAL GMBH
Inventors: COCHRAN, Theodore, R.
COLCHEN, Daniel
ICARD, Sullivan
Title: METHOD OF MANUFACTURING VARIABLE-DISPLACEMENT PISTONS
Abstract:
In a method for manufacturing a pair of variable-displacement pistons 10, a first and a second piston body 12 are provided that each include a hollow body portion 14 with an open end and a closed end. The closed end is adjoined by an actuator arm 16 monolithically formed with the hollow body portion 14. A monolithic dual piston head is provided that includes a first head piston head and a second piston head extending parallel to each other at an axial distance spanned by a recessed hub. The piston heads are simultaneously friction-welded to the open ends of the first and second piston bodies. The first piston head is separated from the second piston head by removing the recessed hub to form a first variable displacement piston and a second variable displacement piston.