Patent ID: 8720393
Filing Date: 2014-05-13
Classification: F01B,F02B,Y10T

Abstract:
1. An engine structure having conjugate cam assembly, comprising: a piston received in a cylinder for reciprocally linearly shifting in relation to an axial direction of the cylinder; a connection rod having a first end and a second end, wherein the first end is pivotally connected to the piston, so that the connection rod is simultaneously moved with the piston; a roller rocker having a power source end, a first roller connection point, a second roller connection point and a fulcrum point, wherein the second end of the connection rod is pivotally connected to the power source end for driving the first and second roller connection points to rotate in relation to the fulcrum point; a push roller pivotally connected to the first roller connection point of the roller rocker; a pull roller pivotally connected to the second roller connection point of the roller rocker; and a conjugate cam assembly mounted on a camshaft and having a push cam and a pull cam connected to the push cam; wherein the push cam has a non-circular cam profile different from that of the pull cam; and wherein the cam profile of the push cam is in contact with the push roller, while the cam profile of the pull cam is in contact with the pull roller; wherein the engine structure is a four-stroke type engine structure, and one circle of rotation of the conjugate cam assembly and the camshaft is corresponding to all of a power stroke, an exhaust stroke, an intake stroke and a compression stroke of the piston of the engine structure; a first included angle is defined between a connection line of the power source end and the fulcrum point and a connection line of the first roller connection point and the fulcrum point, and the first included angle is smaller than 90 degree; the size of the push roller is greater than that of the pull roller, while the size of the push cam is greater than that of the pull cam; and the cam profile of the pull cam is substantially disposed within the range of the cam profile of the push cam.