GB569131A - Improvements relating to internal-combustion-operated free-piston machines - Google Patents

Abstract

569,131. Two-stroke engines. PESCARA, R. P. March 4, 1943, No. 3605. Convention date, July 7, 1942. [Classes 7 (i) and 7 (ii)] In a free-piston engine or compressor with piston assemblies 10, 10a constrained to move oppositely to each other by connecting-rods 15, 15a coupled to cranks 16 oscillating about a transverse axis Y-Y<1>, cross-head guides 19, 19a for taking the reactions of the small ends of the connecting-rods are disposed laterally of the longitudinal axis X-X in such a manner that the reactions are transmitted to the guides in a plane normal to the transverse axis Y-Y<1>. As shown, the assembly 10 comprises a power piston 11 and a compressor piston 12, while the assembly 10a comprises an opposed power piston 11a and a cushioning piston 12a. The pistons 11, 11a move in a combustion cylinder 2 having inlet and exhaust ports 3, 4. The two cranks 16 are journalled on coaxial pins 16b in the body 1 and move in opposite directions. Cross-heads 21, 21a on the piston assemblies are-connected to slippers 18, 18a moving in the guides 19, 19a by universal joints, two alternative forms of which are shown. In one form, the cross-head 21 is secured to the piston-rod 22 by a pin 20 passing through the piston-rod and located transversely by a collar 24 and cap 25 ; the pin 20 forms one axis of the universal joint, the other being formed by a pin 28 passing through an eye in the pin 20 and journalled in bearings in the slipper. In the other form, the cross-head 21a is integral with the piston-rod 23a of the assembly 10a. To enable the pins 20 to be removed from the cross-heads, side. openings 30 and removable covers. 31 for the guides 19 are provided. Fig. 3 shows means for lubricating the small ends of the connecting-rods 15 and the slipper 18. An oil duct 33 and dropper 34 supply oil to a groove 35, a bore 37 in the pin 28 and a bore 38 in the pin 20. '