HYDRAULIC CYLINDER FOR AIRCRAFT LANDING GEAR

摘要

A hydraulic cylinder includes: a cylinder tube; a piston; a piston rod; a pair of end covers; and a snubbing mechanism configured to reduce the moving speed of the piston after the piston reaches the vicinity of the end of its stroke. The snubbing mechanism includes: a supply/discharge port formed in an associated one of the end covers; a valve configured to open and close the supply/discharge port; a connector configured to connect the valve and the piston together; and at least one recess extending from the edge of the supply/discharge port. When the piston approaches the end of its stroke, the valve closes the supply/discharge port to form a throttle oil passage, and hydraulic oil is discharged through the throttle oil passage to reduce the moving speed of the piston.

主权项

1. A hydraulic cylinder for an aircraft landing gear, the hydraulic cylinder comprising:
a cylinder tube; a piston configured to define an oil chamber in the cylinder tube; a piston rod connected to the piston; a pair of end covers, each of the end covers being provided at an end of the cylinder tube, and being configured to define an end of a stroke of the piston; and a snubbing mechanism configured to reduce a moving speed of the piston after the piston approaches the end of the stroke, wherein the snubbing mechanism includes:
a supply/discharge port which is provided in the end cover so as to be oriented in a direction of the stroke of the piston and communicate with the oil chamber, and through which hydraulic oil is supplied and discharged into and from the oil chamber;a valve configured to open and close the supply/discharge port in the oil chamber;a connector configured to connect the valve and the piston together so that the valve and the piston are relatively movable; andat least one recess extending from an edge of the supply/discharge port, and when the valve closes the supply/discharge port, defined by the valve to form a throttle oil passage, the throttle oil passage having a smaller cross-sectional area than the supply/discharge port and communicating with the oil chamber, and wherein the snubbing mechanism is configured to:
when the piston approaches the end of the stroke, allow the valve that moves with the piston to close the open supply/discharge port to form the throttle oil passage, andwhen the piston further moves toward the end of the stroke, reduce the moving speed of the piston by discharging the hydraulic oil in the associated oil chamber through the throttle oil passage.