A modular internal combustion engine (10) comprising a cam crank (74) having a piston stroke guide pattern (76) to control the stroke motion profile of the piston (70), which can be expanded by replacing the crank shaft (22) with a longer crank shaft (22), and installing a supplemental engine block (18) with a supplemental cam crank assembly (75).

A modular internal combustion engine (10) comprising a cam crank (74) having a piston stroke guide pattern (76) to control the stroke motion profile of the piston (70), which can be expanded by replacing the crank shaft (22) with a longer crank shaft (22), and installing a supplemental engine block (18) with a supplemental cam crank assembly (75).

An internal combustion engine includes a standard connecting rod as well as a gear rack. The connecting rod can be a standard connecting rod that reciprocates with the piston and that drives a rotatable crank mechanism to convert the reciprocating motion of the piston into rotation of the crankshaft. The gear rack is also connected to and reciprocates with the piston. The gear rack is engaged with a gear that is mounted on the crankshaft. A one-way drive mechanism is provided between the gear and the crankshaft that transmits torque (i.e. rotary force) to the crankshaft only during the power stroke of the piston.

An internal combustion engine includes a standard connecting rod as well as a gear rack. The connecting rod can be a standard connecting rod that reciprocates with the piston and that drives a rotatable crank mechanism to convert the reciprocating motion of the piston into rotation of the crankshaft. The gear rack is also connected to and reciprocates with the piston. The gear rack is engaged with a gear that is mounted on the crankshaft. A one-way drive mechanism is provided between the gear and the crankshaft that transmits torque (i.e. rotary force) to the crankshaft only during the power stroke of the piston.

A crankshaft system is provided. The crankshaft has a main journal, a rod journal rotates around the main journal, a planet gear is attached to the rod journal and can rotate around the rod journal, the rotation of the planet gear is constrained by a constraining gear, the teeth number of the constraining gear is integer k times of the teeth number of the planet gear, a crankpin is mounted on the planet gear, one end of a connecting rod of a piston is attached to the crankpin, the constraining gear is a ring gear or a sun gear, the trajectory of the crankpin is noncircular. The combustion chamber volume keeps constant from 0° ATDC to 14° ATDC, or the minimum combustion chamber volume extends from TDC to 14° ATDC or after 14° ATDC.

A motion conversion apparatus (100) comprises a rodrack assembly (110), which includes two guide members (140) and a first gear connection member (120) comprising opposing engaging arrangements (1201). The motion conversion apparatus (100) further comprises a gearshaft member (150) causing reciprocating linear motion of the rodrack assembly (110) along a reciprocation direction (D) by rotational motion of the gearshaft member (150). The gearshaft member (150) includes a second gear connection member (160) configured to engage with the first gear connection member (120), and a guiding surface arrangement (170) configured to contact a guide member (140) during rotational motion of the gearshaft member (150), wherein one gearshaft member (150) revolution causes a single period of reciprocating linear motion of the rodrack assembly (110). The guiding surface arrangement (170) contacts one of the two guide members (140) at an endpoint of the reciprocating linear motion of the rodrack assembly (110).

A motion conversion apparatus (100) comprises a rodrack assembly (110), which includes two guide members (140) and a first gear connection member (120) comprising opposing engaging arrangements (1201). The motion conversion apparatus (100) further comprises a gearshaft member (150) causing reciprocating linear motion of the rodrack assembly (110) along a reciprocation direction (D) by rotational motion of the gearshaft member (150). The gearshaft member (150) includes a second gear connection member (160) configured to engage with the first gear connection member (120), and a guiding surface arrangement (170) configured to contact a guide member (140) during rotational motion of the gearshaft member (150), wherein one gearshaft member (150) revolution causes a single period of reciprocating linear motion of the rodrack assembly (110). The guiding surface arrangement (170) contacts one of the two guide members (140) at an endpoint of the reciprocating linear motion of the rodrack assembly (110).

The present invention provides a novel internal combustion engine design and methods for using the same. The internal combustion engine of the present invention may include two rotors on which the pistons and cylinders and pistons are mounted, respectively. A plurality of cylinders mounted on a cylinder rotor, and a plurality of pistons mounted on a piston rod rotor, where the arrangements of the pistons and cylinders are complementary and each piston is paired with one of the cylinders. The cylinder rotor and the piston rod rotor may be position at oblique angle relative to one another, such that their central axes are located on a same plane, but the axes are not coaxially aligned and intersect on that plane.

The present invention provides a novel internal combustion engine design and methods for using the same. The internal combustion engine of the present invention may include two rotors on which the pistons and cylinders and pistons are mounted, respectively. A plurality of cylinders mounted on a cylinder rotor, and a plurality of pistons mounted on a piston rod rotor, where the arrangements of the pistons and cylinders are complementary and each piston is paired with one of the cylinders. The cylinder rotor and the piston rod rotor may be position at oblique angle relative to one another, such that their central axes are located on a same plane, but the axes are not coaxially aligned and intersect on that plane.

Combustion engine with a variable compression ratio which, according to the invention, includes the following items: engine body, crankshaft with crank pins mounted rotatably in the body, cylinders, pistons connected to the crankshaft via pin connecting rod sand control arms as well as the control arm rod located inside the engine body, with eccentrics mounted on it, on which eccentrics for each piston there are separately mounted control arms, it is characterized by the fact that on the control arm rod (19) aside from the rigidly mounted eccentrics (18), on which single control arms (14) are rotatably mounted, there are also rotatably mounted eccentrics (23), on which single control arms (14) are rotatably mounted, where preferably on the eccentrics (18) are mounted the control arms (14) for one row of cylinders (5), while for the eccentrics (23) are mounted the control arms (14) for the other row of cylinders (5), additionally the engine contains a mechanism for changing the compression ratio consisting of the control arm rod (19) with eccentrics (18, 23) mounted on the control arm rod (19) as well as coupling elements that connect the elements of the mechanism which ensure that neighboring eccentrics (18, 23) rotate in opposite directions.