TH70588A - Engine tongue operating system - Google Patents

Abstract

DC60 (31/03/48) A single engine control system is provided in which one end of the first connecting arm 61 is supported and rotatable at a fixed position in the engine housing, and the other end of the second connecting arm 62 is supported and rotatable by a movable shaft 68a. This shaft is rotatable and connected to rocker arm 63, which has a camshaft 65 that opposes the control camshaft 69 and is locked between them. This connection transmits force in the opening direction to valve 19, which is tilted by valve spring 24, and in the closing direction to rocker arm 54, which is different from valve spring 24 that opposes rocker arm 63 in the direction in which the camshaft 65 opposes the control camshaft 69. This ensures the ability to track the opening/closing operation and allows for a reduction in the size of the system while allowing for continuously variable valve lift. It is also possible to improve accuracy, with such improvements the lift distance is controlled when the engine valve needs to be opened slightly. One engine operating system is provided in which one end of the first connecting rod arm 61 is supported by a rotatable shaft at a fixed position on the engine housing, and the other end of the second connecting rod arm 62 is supported by a rotatable shaft 68a, which is connected by a rotatable shaft 63, with a camshaft 65 opposing the control camshaft 69 and locked between them and connected to transfer force in the opening direction to the engine valve 19, which is tilted by valve spring 24 in the closing direction. The valve spring 54, which is different from valve spring 24, opposes the valve spring 63 in the direction in which the camshaft 65 opposes the control camshaft 69. This ensures accuracy. The ability to monitor opening/closing operations allows for system minimization while allowing continuously variable engine valve lift. It also makes it possible for the engine to be slightly opened.

Claims (7)

1. The engine valve operating system consists of a rocker arm 63, which has a camshaft support 65 that opposes the control camshaft 69 and is locked between them and connected to apply force to the engine valve 19 in the opening direction, which is opposed by a valve spring 24 in the closing direction. The first connecting arm 61 has one end connected to the rocker arm 63, which is rotatable, and the other end is connected, also rotatable, to the rocker arm 63 and another end is connected, also rotatable, to a fixed position on the engine housing 10. The second connecting arm 62 has one end connected, which is rotatable, to the rocker arm 63 and the other end is supported, also rotatable, by a movable shaft 68a. The drive tool 72 is connected to such movable shaft 68a to allow the position of the movable shaft 68a to be arranged to continuously vary the engine valve lift 19. And the rocker arm resistance spring 54, which differs from the valve spring 24 and which resists the rocker arm resistance spring 63 in the direction in which the camshaft support 65 resists the camshaft control spring 69. 2. An engine valve operating system conforming to claim 1, on which the roller which is the camshaft support 65 is axially supported by a rocker arm 63 through a connecting shaft 64 which connects one end of the first connecting arm 61 to the rocker arm 63. A locking pin 55, positioned outside the movable range of the second connecting arm 62 on a shadow portion of a plane perpendicular to the axis of the movable shaft 68a, is mounted on a camshaft holder 46 provided in the engine housing 10 to support a rotatable camshaft 31 on which the camshaft 69 is provided and one end of the rocker arm resistance spring 54 is coupled to the said connecting shaft 64, while the other end of the rocker arm resistance spring 54 is coupled to the said locking pin 55. 3. The engine valve operating system conforming to claim 1, in which the valve lifter spring 54 is a torsion coil spring that encloses one of the shafts of the number of fixed support shafts 67 and the movable shaft 68a which supports the opposite ends of the first and second connecting rod arms 61,62, and which are rotatable. 4. The engine valve operating system conforming to claim 3, in which the drive mechanism 72 is connected to the control shaft 68, which is formed into a crankshaft shape, and to which a pair of rocker arms 68b are positioned on opposite sides of the second connecting arm 62, a movable shaft 68a connects the crankshaft 68b at a right angle, and a support shaft 68c, which is connected to the crankshaft 68b at a right angle at an offset position from the movable shaft 68a and is supported by the rotatable shaft by the engine housing 10, and a pair of rocker arms 68b are positioned inward by a pair of rocker arm springs 54 that surround the support shaft, which is fixed 67 on opposite sides of the other end of the first connecting arm 61. 5. An engine valve operating system compliant with claim 3 or claim 4, in which a pair of support spurs 53 supporting the fixed support shaft 67 is provided, a first piece 61 between those support spurs 53, and a rocker arm resistance spring 54 are provided between the engine housing 10 and the rocker arm 63 to surround those support spurs 53. 6. The engine operating system conforming to claim 5, in which a fixed cylinder support 61b is provided at the opposite end of the first connecting rod arm 61 in order to be supported in a rotatable manner by the fixed support shaft 67. The fixed support 61b has an outer border aligned inward of the outer border of each rocker arm spring 54 as seen from the side, and a number of projections 56, 57 are provided at the opposite axial end of the fixed support 61b in a stranded direction to protrude from the opposite axial end to prevent the rocker arm spring 54 from being deployed onto the fixed support. 7. An engine valve operating system compliant with claim 6, in which the protrusions 56, 57 are arranged outside the operating range of the second connecting rod arm as mentioned 61.