737-300 400 500 AMM 飞机维护手册 起落架 LANDING GEAR 2(9)

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 D.  Shocks to the nose gear shock strut are absorbed by the restricted flow of hydraulic fluid through the annular space between the orifice and the tapered metering pin and by the restricted flow of fluid through the rebound valve piston ring. When the inner cylinder is being compressed, the tapered metering pin, which is attached to the lower support tube in the inner cylinder, moves through the orifice in the upper support tube. This movement of the metering pin progressively reduces the area of the annular space between the orifice and metering pin. The reduction in area results in a diminishing rate of hydraulic fluid flow from the inner cylinder chamber to the upper side of the piston which produces increasing resistance to compression of the shock strut. Landing shocks and shocks incurred while taxiing are absorbed by the increasing volume of hydraulic fluid above the piston which further compresses the volume of compressed air or nitrogen in the upper end of the outer cylinder.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
DRAG LINK TRUNNION PIN
SPHERICAL 
BEARING 
UPPER DRAG 
BRACE LINK 
LOCK LINK 
ASSEMBLY 
LOCK LINK 
NOSE GEAR  BUNGEE 
ACTUATOR 
LOCK BRACE ASSEMBLY 
LOWER DRAG BRACE LINK 
VALVE COVER 
TRUNNION PIN 
SHOCK STRUT 
OUTER CYLINDER 
TOWING LUG 
CHECK VALVE 
SHOCK STRUT 
INNER CYLINDER 

Nose Gear Component Location
Figure 1

SHOCK STRUT TRUNNION PIN
SPHERICAL BEARING
LOCK ACTUATOR (UPLOCK-DOWNLOCK)
STEERING CYLINDER
STEERING COLLAR
UPPER TORSION
LINK
APEX PIN
LOWER TORSION
LINK
JACKING POINT
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

AXLE

UPPER BEARING
REBOUND VALVE SEE
A
UPPER
CENTERING
CAM
ORIFICE
SUPPORT
TUBE
LOWER
CENTERING
CAM
LOWER
BEARING
CHECK VALVE
FULLY COMPRESSED
Nose Gear Shock Strut Schematic
Figure 2 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

ORIFICE SUPPORT TUBE
UPPER BEARING
REBOUND VALVE SEE
A
UPPER CENTERING CAM
LOWER CENTERING CAM
LOWER
BEARING
SCRAPER
DRAIN TUBE
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
INNER CYLINDER
INNER
CAM  CYLINDER
REBOUND VALVE PISTON RING UPPER CENTERING
STATIC POSITION OF
CAM
REBOUND VALVE PISTON RING

Nose Gear Shock Strut Schematic Figure 2 (Sheet 3)

UPPER BEARING
OUTER CYLINDER
REBOUND VALVE PISTON RING
UPPER
BEARING
OUTER
CYLINDER
REBOUND VALVE PISTON RING
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