Abstract: A shock absorber with lubricated bearings for an aircraft landing gear includes a piston that is received in a cylinder, and an upper bearing fixed to the piston that slidably engages an inner surface of the cylinder. A lower bearing extends inwardly from a lower portion of the cylinder and engages an outer surface of the piston. The lower bearing has a center axis and defines an annular bearing surface configured to slidably engage the piston outer surface. The annular bearing surface has a first portion that extends circumferentially more than one hundred eighty degrees about the center axis at a constant radius, defining a circular annular segment. A second portion closes the circular annular segment and defines a shallow channel or pocket in the annular bearing surface. In some embodiments the lower bearing further comprises oppositely disposed frustoconical thrust portions.

Abstract: A shock absorber with lubricated bearings for an aircraft landing gear includes a piston that is received in a cylinder, and an upper bearing fixed to the piston that slidably engages an inner surface of the cylinder. A lower bearing extends inwardly from a lower portion of the cylinder and engages an outer surface of the piston. The lower bearing has a center axis and defines an annular bearing surface configured to slidably engage the piston outer surface. The annular bearing surface has a first portion that extends circumferentially more than one hundred eighty degrees about the center axis at a constant radius, defining a circular annular segment. A second portion closes the circular annular segment and defines a shallow channel or pocket in the annular bearing surface. In some embodiments the lower bearing further comprises oppositely disposed frustoconical thrust portions.

Abstract: The present invention provides a generic synchronized motion control system for multiple dynamic systems. Free choices of synchronization strategies are allowed with no implementation modification. Furthermore, synchronization selections are converted into a numerically searchable parameter space that enables systematic development, automated process, and performance optimization. In addition, the present invention enables a uniform computer program of control synchronization algorithm due to its innovation of separating synchronization strategy from control implementation.

Abstract: The present invention provides a generic synchronized motion control system for multiple dynamic systems. Free choices of synchronization strategies are allowed with no implementation modification. Furthermore, synchronization selections are converted into a numerically searchable parameter space that enables systematic development, automated process, and performance optimization. In addition, the present invention enables a uniform computer program of control synchronization algorithm due to its innovation of separating synchronization strategy from control implementation.