VALVE TIMING ADJUSTMENT APPARATUS

摘要

A planetary carrier supports a geared rotor from an inside in a radial direction, and receives a radial load in a first region, which is offset to one end from a center position in an axial direction. A ball bearing roller supports the planetary carrier from an outside in the radial direction in a second region, which is offset to an other end from the center position. The ball bearing roller is a single-row ball bearing roller that has an outer ring supported by a drive rotor, an inner ring which supports the planetary carrier, and a plurality of rolling elements which are rotatably installed in a single row to be in contact with and between the outer and the inner rings. The geared rotor is tilted relative to the axial direction, and contacts a driven rotor in the axial direction. An angle of the geared rotor relative to the axial direction is set to be smaller than a maximum allowable angle at which the inner ring is allowed to be tilted relative to the axial direction.

主权项

1. A valve timing adjustment apparatus for adjusting valve timing of a valve, the valve being opened and closed by a rotation of a cam shaft, the cam shaft being rotated by torque transmitted from a crank shaft in an internal combustion engine, the valve timing adjustment apparatus comprising:
a first rotor having a first gear portion and rotatably coupled with one of the crank shaft or the cam shaft; a second rotor having a second gear portion and interposing the first rotor on both sides in an axial direction, the second rotor rotatably coupled with an other of the crank shaft or the cam shaft; a geared rotor meshing with the first gear portion and the second gear portion and moving in planetary motion to adjust a relative phase between the first rotor and the second rotor; a planetary carrier supporting the geared rotor in a radial direction from an inside of the geared rotor, and receiving a radial load in a first region, the first region being offset to one end from a center position of the planetary carrier in the axial direction; and a ball bearing roller that is supported by the second rotor and supports the planetary carrier in the radial direction from an outside of the planetary carrier in a second region, the second region being offset to an other end from the center position of the planetary carrier in the axial direction, wherein the ball bearing roller is a single-row ball bearing roller that has an outer ring supported by the second rotor, an inner ring that supports the planetary carrier, and a plurality of ball bearings that are rotatably installed in a single row to be in contact with and between the outer ring and the inner ring, the geared rotor is tilted relative to the axial direction by the radial load and brought into contact with the first rotor or the second rotor in the axial direction, and an angle of the geared rotor relative to the axial direction is set to be smaller than a maximum allowable angle at which the inner ring is allowed to be tilted relative to the axial direction.