Abstract

A clip-fastened raceway for a variable compression ratio engine includes: at least one curved segment whose outer surface cooperates with a raceway housed in the transmission member or in the control member of the variable compression ratio engine and whose inner surface is maintained in contact with a curved outer surface housed in the toothed wheel of the engine; at least one clip, housed in at least one of the ends of the curved segment and fastened to one or the other of the ends of the curved outer surface housed in the toothed wheel and hooking onto a hook or protrusion which the wheel includes in the vicinity of the end of its curved outer surface, the hook or protrusion being complementary to that of the clip so as to be able to cooperate with the latter.

IPC Classes  ?

• F02B 75/02 - Engines characterised by their cycles, e.g. six-stroke
• F16C 35/02 - Rigid support of bearing unitsHousings, e.g. caps, covers in the case of sliding-contact bearings
• F16C 17/02 - Sliding-contact bearings for exclusively rotary movement for radial load only
• F02B 75/04 - Engines with variable distances between pistons at top dead-centre positions and cylinder heads
• F01B 9/02 - Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups with crankshaft
• F16C 33/60 - RacewaysRace rings divided
• F16C 29/00 - Bearings for parts moving only linearly

Abstract

A clip-fastened raceway for a variable compression ratio engine includes: at least one curved segment whose outer surface cooperates with a raceway housed in the transmission member or in the control member of the variable compression ratio engine and whose inner surface is maintained in contact with a curved outer surface housed in the toothed wheel of the engine; at least one clip, housed in at least one of the ends of the curved segment and fastened to one or the other of the ends of the curved outer surface housed in the toothed wheel and hooking onto a hook or protrusion which the wheel includes in the vicinity of the end of its curved outer surface, the hook or protrusion being complementary to that of the clip so as to be able to cooperate with the latter.

IPC Classes  ?

• F02B 41/00 - Engines characterised by special means for improving conversion of heat or pressure energy into mechanical power
• F16C 17/02 - Sliding-contact bearings for exclusively rotary movement for radial load only
• F02B 75/04 - Engines with variable distances between pistons at top dead-centre positions and cylinder heads
• F01B 9/02 - Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups with crankshaft
• F16C 33/60 - RacewaysRace rings divided
• F16C 29/00 - Bearings for parts moving only linearly

Abstract

The elastic fixing for a piston (2) of a variable compression ratio engine (10) includes at least one metal rod (15) kept under tension between the piston (2) and the transmission member (3) and which applies a strong contact pressure between the base of the piston (2) and the top face of the transmission member (3), the piston (2) being tightened according to a previously calculated angle enabling the metal rod (15) consisting of a stud (16) to be subjected to a desired tension force and the tightening prestress to be reached between the piston (2) and the transmission member (3), and indexed in rotation relative to the transmission member (3), by an additional tightening which does not significantly increase the tightening pre-stress, the stud (16) continuing to elongate with the same tension force by plastic deformation.

IPC Classes  ?

• F02B 75/32 - Engines characterised by connections between pistons and main shafts and not specific to preceding main groups

Abstract

A pressure device maintains the raceways (48, 160 to 165) of the main moving components (3, 5, 7 and 40) of a variable compression ratio engine permanently in contact with one another and with the faces on which they rest in a cylinder case. The inventive device includes pressure elements which are solidly connected to the cylinder case (100) and which exert a pressure force on a control rack (7) having a toothed segment (75) formed by teeth (74). The pressure force is applied against a support surface (78) provided on the lower part of the rack (7).

IPC Classes  ?

• F02B 75/04 - Engines with variable distances between pistons at top dead-centre positions and cylinder heads

Abstract

and lifting element (410) including at least one electric motor (480) designed to rotate at least one screw (481, 482) making it possible to lift from or place on its seat at least one ball.

IPC Classes  ?

• F02B 75/04 - Engines with variable distances between pistons at top dead-centre positions and cylinder heads
• F02B 75/26 - Engines with cylinder axes coaxial with, or parallel or inclined to, main-shaft axisEngines with cylinder axes arranged substantially tangentially to a circle centred on main-shaft axis
• F02B 75/32 - Engines characterised by connections between pistons and main shafts and not specific to preceding main groups
• F02D 15/04 - Varying compression ratio by alteration of volume of compression space without changing piston stroke

Abstract

A device for measuring the effective volumetric ratio of at least one cylinder in a variable compression-ratio engine, includes at least one target passage sensor (91) attached on the cylinder casing (100) and detecting the passage of at least one target (92) connected to the piston (2) of the engine, the target passage sensor interacting with at least one angular position sensor of the crankshaft (93) of the engine, and one calculator (94).

IPC Classes  ?

• G01M 15/08 - Testing internal-combustion engines by monitoring pressure in cylinders