# US 2013/0156356 A1 · Clip-fastened raceway for a variable compression ratio engine

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- Number: US 2013/0156356 A1
- Document ID: US20130156356A1
- Status: Published application
- Kind: A1
- Application number: 13/717,918
- Filed: 2012-12-18
- Published: 2013-06-20
- Earliest claimed: 2011-12-19
- Assignees: MCE 5 Development; Vianney Rabhi
- Inventors: Sylvain BIGOT; Philippe DURY
- Web page: https://patentgrep.com/patent/US20130156356A1

## CPC

- F16C 17/02: for radial load only
- F01B 9/02: with crankshaft
- F01B 9/026: {Rigid connections between piston and rod; Oscillating pistons}
- F02B 75/04: Engines with variable distances between pistons at top dead-centre positions and cylinder heads
- F02B 75/045: {by means of a variable connecting rod length}
- F02B 75/048: {by means of a variable crank stroke length}
- F16C 33/60: divided {or split, e.g. comprising two juxtaposed rings}
- F16C 35/02: in the case of sliding-contact bearings
- F16C 29/00: Bearings for parts moving only linearly (F16C32/06 takes precedence; incorporated in flexible shafts F16C1/28 {; parts of bearings in general and special methods for making bearings or parts thereof in general F16C33/00})
- F16C 35/00: Rigid support of bearing units; Housings, e.g. caps, covers (F16C23/00 takes precedence)
- F16C 2226/54: with rivets
- F16C 2226/74: with snap-fit, e.g. by clips
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F01B: MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES (of rotary-piston or oscillating-piston type F01C; of non-positive-displacement type F01D; internal-combustion engines F02B; combustion-product engine plants F02G; machines or engines, other than of positive-displacement type, for liquids F03B; positive-displacement engines driven by liquids F03C; wind motors F03D; positive-displacement machines for liquids F04B; rotary-piston, or oscillating-piston, positive-displacement machines for liquids F04C)
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)

## 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.

## Claims

### Claim 1

Clip-fastened raceway for a variable compression ratio engine (10), said engine comprising a cylinder case (100) receiving a transmission member (3) provided with a rack, to which are fastened a combustion piston (2), a control member (7) provided with a rack and connected to a hydraulic double-acting control actuator (8), a toothed wheel (5) which cooperates, on the one hand with the transmission member (3), and on the other hand with the control member (7) to transmit the mechanical work produced by the combustion on the combustion piston (2) by means of a connecting rod (6) connected to a crankshaft (9), characterized in that it comprises:
at least one curved segment (51) whose outer surface (52) cooperates with a raceway housed in the transmission member (3) or in the control member (7) of the variable compression ratio engine (10) and whose inner surface (53) is maintained in contact with a curved outer surface (54) housed in the toothed wheel (5) of said engine;
at least one clip (55), housed in at least one of the ends of the curved segment (51) and fastened to one or the other of the ends of the curved outer surface (54) housed in the toothed wheel (5) and hooking onto a hook or protrusion (56) which said wheel comprises in the vicinity of said end of its curved outer surface (54), said hook or protrusion being complementary to that of the clip (55) so as to be able to cooperate with the latter.

### Claim 2 (depends on 1)

Clip-fastened raceway for a variable compression ratio engine according to claim 1, characterized in that the curved segment (51) is laterally maintained on the curved outer surface (54) housed in the toothed wheel (5) by at least one lateral stop abutment (57) which prevents said segment (51) from moving parallel to its axis of curvature.

### Claim 3 (depends on 2)

Clip-fastened raceway for a variable compression ratio engine according to claim 2, characterized in that the lateral stop abutment is constituted of at least one edge (57) housed in at least one side of the curved outer surface (54) of the toothed wheel (5).

### Claim 4 (depends on 3)

Clip-fastened raceway for a variable compression ratio engine according to claim 3, characterized in that the edge (57) housed in at least one side of the curved outer surface (54) of the toothed wheel (5) comprises recesses (58) in the area of the bases of the teeth (59) which the toothed wheel comprises.

### Claim 5 (depends on 1)

Clip-fastened raceway for a variable compression ratio engine according to claim 1, characterized in that the inner surface (53) of the curved segment (51) comprises longitudinal and/or lateral stop pins (61) which cooperate by nesting with pins or grooves (61) having a reverse relief which the curved outer surface (54) housed in the toothed wheel comprises.

### Claim 6 (depends on 1)

Clip-fastened raceway for a variable compression ratio engine according to claim 1, characterized in that at least one of the ends of the curved segment (51) is fastened to the toothed wheel (5) by means of a mechanical anchoring connection (62).

### Claim 7 (depends on 1)

Clip-fastened raceway for a variable compression ratio engine according to claim 1, characterized in that the inner surface (53) of the curved segment (51) and/or the curved outer surface (54) housed in the toothed wheel (5) comprises raised or recessed geometric patterns (63) which allow the lubricating oil comprised by the casing of the variable compression ratio engine (10) to circulate between said inner surface (53) and said curved outer surface (54).

### Claim 8 (depends on 1)

Clip-fastened raceway for a variable compression ratio engine according to claim 1, characterized in that the curved segment (51) cooperates with a shim (64) sandwiched between said segment (51) and the curved outer surface (54) housed in the toothed wheel (5).

### Claim 9 (depends on 1)

Clip-fastened raceway for a variable compression ratio engine according to claim 1, characterized in that the curved segment (51) is longitudinally maintained on the curved outer surface (54) housed in the toothed wheel (5) by at least one longitudinal stop abutment which prevents said segment (51) from rotating about its axis of curvature.