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1. A four-cylinder four-stroke engine without a crankshaft and valves comprising:
a base, a gas valve, a holder, a driving device, and a driven assembly, and a seat, wherein when a four-cylinder four-stroke engine operates, a plurality of cylinders push plural pistons in the plurality of cylinders of the driving device so as to drive plural pushing posts connecting with the plural pistons to move upward and downward repeatedly, such that the driven assembly coupling with the plural pushing posts is pushed to drive a rotary shaft to rotate, thus generating a rotational energy, and the driven assembly simultaneously pushes a gear set of the driving device so that the gear set drives the gas valve on the base to rotate 360 degrees to feed and exhaust gases in the base, characterized in that: the base includes a gas groove defined thereon, a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder, wherein any two adjacent of the first, the second, the third, and the fourth cylinders are symmetrically arranged around the gas groove, and the first cylinder has a first flowing hole for communicating with the gas groove, the second cylinder has a second flowing hole for communicating with the gas groove, the third cylinder has a third flowing hole for communicating with the gas groove, the fourth cylinder has a fourth flowing hole for communicating with the gas groove; the gas groove has a first inlet formed on a side wall thereof and communicating with an exterior of the base, and a first outlet defined on a bottom surface thereof and communicating with the exterior of the base; wherein a bottom plate of the holder is screwed on a top surface of the base by ways of plural screw elements, such that the gas groove, the first cylinder, the second cylinder, the third cylinder, the fourth cylinder of the base are covered by the bottom platen, and the gas groove includes a washer fixed on a top rim thereof so that the holder closes the gas groove; the gas valve is disposed in the gas groove and includes two second inlets which communicate with each other and two third inlets which are in communication with each other, wherein one of the two second inlets is defined on a top surface of the gas valve, and the other of the two second inlets is formed on an external wall of the gas valve, one of the two third inlets is defined on the top surface of the gas valve, and the other of the two third inlets is formed on the external wall of the gas valve; the gas valve also includes two second outlets which communicate with each other and two third inlets which are in communication with each other, wherein one of the two second outlets is defined on a bottom surface of the gas valve, and the other of the two second outlets is formed on the external wall of the gas valve, one of the two third outlets is defined on the bottom surface of the gas valve, and the other of the two third outlets is formed on the external wall of the gas valve; wherein an angle between the two second inlets and the two third outlets is 135 degrees, and between the two third inlets and the two second outlets is 135 degrees, and when the gas valve operates, the two second inlets, the two third inlets, the two second outlets, and the two third outlets are in communication with the first flowing hole, the second flowing hole, the third flowing hole, and the fourth flowing hole; and the gas valve further includes four first bearings, mounted on the top surface of the gas valve, extending out of the bottom plate, and driving a connecting rod of the gas valve; the driving device includes four pushing posts for connecting with a first piston, a second piston, a third piston, and a fourth piston, the driven assembly connects with four top ends of the four pushing rods, and the driving device also includes the rotary shaft connecting with a first guide peg of the driven assembly, the gear set coupled with a second guide peg of the driving device, four ends of the four pushing posts join with a first support, a second support, a third support, and a fourth support via four pivots; the driven assembly includes a first tube, a second tube, the first support, the second support, the third support, and the fourth support, wherein the first tube is mounted and moves horizontally in a trench of the second tube, the first tube has a first eyelet and a second eyelet defined on two ends thereof, and the first eyelet has a first aperture formed on a bottom end thereof, the second eyelet has a second aperture arranged on the bottom end thereof and communicating with the first eyelet, the first eyelet is used to insert the first support for coupling with one of the four pushing posts, and the second eyelet is used to insert the second support for connecting with one of the four pushing posts, wherein the first support extends and retracts in the first eyelet, and the second support extends and retracts in the second eyelet, such that gas exhausts out of the first aperture and the second aperture; the second tube has a third eyelet and a fourth eyelet defined on two ends thereof and communicating with the trench, the third eyelet is used to insert the third support for coupling with one of the four pushing posts, and the fourth eyelet is applied to insert the fourth support for connecting with one of the four pushing posts, wherein the third support extends and retracts in the third eyelet, and the fourth support extends and retracts in the fourth eyelet, such that the gas exhausts out of the trench, and the second tube has the first guide peg and the second guide peg; wherein the rotary shaft includes a vertical extension and a horizontal extension being perpendicular to the vertical extension and in connection with the vertical extension, the vertical extension is fixed by a second bearing and extends out of the seat, the horizontal extension has a first tilted bar obliquely extending from one end thereof, and the first tilted bar has a first opening defined thereon, the first opening has a first rotatable bearing secured therein, the first rotatable bearing is in connection with the first guide peg of the second tube so that a rotary free degree is formed between the first guide peg and the first rotatable bearing; the gear set includes three panels 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 at least one of the panels, a drive gear and a driven gear coupling with the bottom portion of at least one of the panels by using a rotary stem and meshing with the upper gear and the lower gear, wherein the drive gear has a second tilted bar mounted thereon for corresponding to the 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 so that a rotary free degree is formed between the second guide peg and the second rotatable bearing, and the 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 four 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 driven assembly and the gas valve, and the rotating speed ratio is 4:1; the seat has a peripheral side coupling with the top rim of the holder, a fixed pole axially connecting with the holder and the base and screwed by a nut; wherein the vertical extension of the rotary shaft extends out of the seat, and the vertical extension and the seat are fixed together by the second bearing so that the vertical extension has an axially rotary free degree. |
