PHASE VARYING APPARATUS FOR AUTOMOBILE ENGINE

摘要

A phase varying apparatus capable of smoothly varying the phase angle of a camshaft relative to a drive rotor by comprising: a drive rotor supported by a camshaft and driven by a crankshaft; a first control rotor integral with the camshaft; a first torquing mechanism for providing the first drive rotor with a torque in one direction, and a reverse rotation mechanism for proving the first control rotor with a torque in the opposite direction, wherein the reverse rotation mechanism comprises a first radius-decreasing guide groove formed in the control rotor, a crank member adapted to rotate about a position offset from the rotational axis of the drive rotor, and a first pin mechanism mounted on the crank member and movable in the radius-decreasing guide groove, and a second operative mechanism for rotating the first control rotor in the opposite rotational direction relative to the drive rotor.

主权项

1. A phase varying apparatus for an automobile engine, comprising:
a camshaft; a drive rotor coaxially mounted on the camshaft, the drive rotor being rotatable about a first rotational axis under a torque exerted by the crankshaft; a first control rotor integral with and coaxial with the camshaft; a second control rotor coaxially and rotatably mounted on the camshaft; a first torquing mechanism for rotating the first control rotor relative to the drive rotor; a second torquing mechanism for rotating the second control rotor relative to the first control rotor; and a reverse rotation mechanism for rotating the first control rotor relative to the drive rotor in association with the second torquing mechanism, in the opposite rotational direction as compared with the rotational direction caused by the action of the first torquing mechanism,the phase varying apparatus characterized in that
the reverse rotation mechanism comprises:
a first operative mechanism having
a first radius-decreasing guide groove formed in the first control rotor to extend substantially along the circumference of the first control rotor such that the radius of the first radius-decreasing guide groove from the first rotational axis decreases with the length of the groove,a crank member mounted on the drive rotor rotatably about a second rotational axis which is offset from the first rotational axis, anda first pin mechanism mounted on the crank member such that the pin mechanism is in engagement with the first radius-decreasing curved guide groove slidably in one direction of the guide groove under the action of the first torquing mechanism; anda second operative mechanism for rotating the first control rotor relative to the drive rotor in the opposite rotational direction with respect to the rotation thereof caused by the action of the first torquing mechanism, by moving the first pin mechanism in the first radial guide groove in the other direction, under the action of the second torquing mechanism.