A power-driven reciprocating tool may include a transmission mechanism that converts rotational force from a motor to linear force to be output by a reciprocating mechanism coupled thereto, and a counterbalancing mechanism coupled to the transmission mechanism to counter-balance forces generated by the reciprocating mechanism. The transmission mechanism may include a planetary gear assembly including a sun gear in meshed engagement with at least one planet gear. In response to a force converted by and transmitted from the transmission mechanism, the reciprocating mechanism may move in a first linear direction, and the counterbalancing mechanism may move in a second linear direction, opposite the first linear direction. The opposite linear movement of the reciprocating mechanism and the counterbalancing mechanism may counteract forces generated by the reciprocating motion of the reciprocating mechanism, thus reducing vibration output by the tool.

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 driving mechanism for fastener driving machine, including a rotatable crank; a driving rack element rotatably installed on the crank, which comprises an engaging element, a support element and a driving rack; at least one fixed guide element. The support element and/or engaging element can move along the set trajectory. The present invention has a simple structure, a few parts and stable operation. When the crank rotates, the motion trajectory of the engaging element is straight or approximately O°, so as to reduce the kinetic friction force of load to the maximum extent, preventing wear problem, and guaranteeing constant direction of thrust on the impact unit in the course of compressed energy storage and low eccentric load in late stage, the quick release of driving mechanism is implemented, the operational stability and smoothness of impact unit are guaranteed, the work quality is upgraded.

A driving mechanism for fastener driving machine, including a rotatable crank; a driving rack element rotatably installed on the crank, which comprises an engaging element, a support element and a driving rack; at least one fixed guide element. The support element and/or engaging element can move along the set trajectory. The present invention has a simple structure, a few parts and stable operation. When the crank rotates, the motion trajectory of the engaging element is straight or approximately O°, so as to reduce the kinetic friction force of load to the maximum extent, preventing wear problem, and guaranteeing constant direction of thrust on the impact unit in the course of compressed energy storage and low eccentric load in late stage, the quick release of driving mechanism is implemented, the operational stability and smoothness of impact unit are guaranteed, the work quality is upgraded.

This patent discloses one cylinder axial internal combustion engine having Scotch-Yoke based two phase fuel compression system. Scotch-Yoke actuator employed here is a specially modeled Multi Purpose Multi H-Slot double action Scotch-Yoke Actuator. Each H-slot is quad-laterally operated by a special mechanism. It performs suction and compression in ignition chamber and auxiliary compression chamber via two piston plates one in each chamber and transfers compressed fuel-air mixture from auxiliary compression chamber to ignition chamber through yoke rod. Flywheel is coaxially mounted on the outward side of the auxiliary compression chamber.

This patent discloses one cylinder axial internal combustion engine having Scotch-Yoke based two phase fuel compression system. Scotch-Yoke actuator employed here is a specially modeled Multi Purpose Multi H-Slot double action Scotch-Yoke Actuator. Each H-slot is quad-laterally operated by a special mechanism. It performs suction and compression in ignition chamber and auxiliary compression chamber via two piston plates one in each chamber and transfers compressed fuel-air mixture from auxiliary compression chamber to ignition chamber through yoke rod. Flywheel is coaxially mounted on the outward side of the auxiliary compression chamber.

A fastener driving machine, which comprises an energy storage unit; an impact unit used to drive the energy storage unit to store energy and withstand the energy released by the energy storage unit to drive fasteners into a workpiece; a driving mechanism connected to the impact unit; a rotating power mechanism connected to the driving mechanism to provide rotating power to the driving mechanism. The driving mechanism comprises a stationary annular gear, a crank connected to the rotating power mechanism, and at least one planetary gear which is connected to the crank in a spinning manner and revolves with the rotation of the crank relative to the annular gear, and an engaging shaft eccentrically connected to the planetary gear to push the impact unit. The planetary gear is placed in the annular gear to mesh with the annular gear.

The present disclosure is an all gear infinitely variable transmission that is non-dependent on friction. It can be used in high torque applications, offering a steady and uniform output for a steady and uniform input. Since it allows a co-axial input and output, by using a planetary gear system the output can be made continuous from forward to reverse. It uses a “scotch-yoke” mechanism to convert rotational motion to a linear reciprocating motion. The linear distance of this reciprocating motion—“stroke” is changed by altering the crankpin location of the scotch-yoke mechanism. This reciprocating motion is converted to a rocking motion by using a “rack and pinion” and later converted to a unidirectional motion via a One-Way-Bearing. A set of non-circular gears are used to achieve a steady and uniform output. It employs a very simple mechanism to change the ratio between the input and output of the transmission.

The present disclosure is an all gear infinitely variable transmission that is non-dependent on friction. It can be used in high torque applications, offering a steady and uniform output for a steady and uniform input. Since it allows a co-axial input and output, by using a planetary gear system the output can be made continuous from forward to reverse. It uses a “scotch-yoke” mechanism to convert rotational motion to a linear reciprocating motion. The linear distance of this reciprocating motion—“stroke” is changed by altering the crankpin location of the scotch-yoke mechanism. This reciprocating motion is converted to a rocking motion by using a “rack and pinion” and later converted to a unidirectional motion via a One-Way-Bearing. A set of non-circular gears are used to achieve a steady and uniform output. It employs a very simple mechanism to change the ratio between the input and output of the transmission.