Patent ID: 8448614
Filing Date: 2013-05-28
Classification: F02B

Abstract:
1. A four-stroke engine without a crankshaft and valves comprising: a base including a gas groove defined thereon and a first cylinder and a second cylinder symmetrically arranged around a center of the gas groove, two gas flowing holes defined in the base and communicating with the gas groove, the first cylinder and the second cylinders, a first inlet formed on a side wall of the gas groove and communicating with an exterior of the gas groove, and a first outlet defined on a bottom end of the gas groove and communicating with the exterior of the gas groove, wherein the base also includes the a holder connected with a top surface thereof for covering the gas groove, the first cylinder, and the second cylinder, a bottom plate of the holder has two first orifices, two second orifices, a third orifice between the two first orifices, a fourth orifice between the two second orifices, and plural fifth orifices formed thereon, the first orifices and the third orifice communicate with the first cylinder, and the second orifices and the fourth orifice communicate with the second cylinder; a gas valve including one end formed in a circle shape and a connecting rod connected on a central position of a top surface thereof, the gas valve being disposed in the gas groove and also including a second inlet for communicating with the two gas flowing holes and the first inlet and including a second outlet for communicating with the first outlet; wherein an angle between the second inlet and the second outlet is 90 degree, and the gas valve also includes a first bearing, mounted on the top surface of the gas valve, extending out of the third orifice and the fourth orifice the bottom plate, and connecting with a second bearings inserted into the third orifice and the fourth orifice so as to couple with a driven gear of a gear set of a driving device; a holder connected with the top surface of the base and formed in a hollow square shape, the bottom plate of the holder having the two first orifices, the two second orifices, the third orifice, the fourth orifice, and the plural fifth orifices formed thereon, the holder being formed in the hollow square shape so as to receive the gear set and the driving device; the driving device including two pushing posts for connecting with two pistons, a rotating arm formed in a cross shape and coupling with the two top ends of the two pushing posts, a rotary shaft connecting with a top end of the rotating arm, and the gear set coupling with a bottom end of the rotating arm; wherein the two pushing posts include the two pistons disposed on two bottom ends thereof and inserted into the first cylinder and the second cylinder through a bottom end of the holder; the rotating arm includes a tube having two receiving spaces, two supports having two first ends inserted into the two receiving spaces and two second ends coupling with the two top ends of the two pushing posts, a first guide peg having a first segment connecting with a top rim of the tube and a second segment fixed in the first rotatable bearing of the first opening, and a second guide peg having a first side coupling with a bottom rim of the tube and a second side symmetrical to the first guide peg, such that the rotating arm is formed in the cross shape, and the tube also has two apertures formed thereon for communicating with the two receiving spaces so that the two supports move in the two receiving spaces reciprocately; the gear set includes a panel having two ends connecting with the bottom plate of the holder so as to form a room, an upper gear and a bottom gear inserted into and being coaxial with a top portion of the panel, a drive gear and the driven gear coupling with the bottom portion of the panel by using two rotary stems and meshing with the upper gear and the lower gear, wherein the drive gear has a second tilted bar mounted thereon for corresponding to a first tilted bar, the second tilted bar has a second opening arranged thereon, a second rotatable bearing received in the second opening, such that a distal end of the second guide peg inserts in the second rotatable bearing, and a rotary stem of the driven gear is in connection with a top end of the connecting rod of the gas valve so that when the drive gear rotates two circles, the driven gear is driven by the upper gear and the lower gear to rotate one circle, so the gear set is used to control a rotating speed ratio of the rotary shaft or the rotating arm and the gas valve, and the rotating speed ratio is □ two times; the rotary shaft includes a vertical extension and a horizontal extension being perpendicular to the vertical extension and in connection with the vertical extension, wherein the vertical extension extends out of the seat and is connected with the seat by a third bearing, the horizontal extension located under the seat and has a first tilted bar obliquely extending from one end thereof, and the first tilted bar has an first opening defined thereon, the first opening has a first rotatable bearing secured therein, a distal end of the gear set connects with the connecting rod of the gas valve; the seat including a peripheral side coupling with a top rim of the holder, a fixed pole axially connecting with the holder and the base; wherein a top end of the rotary shaft extends out of the seat.